diff --git a/jedi/api/__init__.py b/jedi/api/__init__.py
index 5edcc3d0..c69a0dec 100644
--- a/jedi/api/__init__.py
+++ b/jedi/api/__init__.py
@@ -120,6 +120,7 @@ class Script(object):
         )
         debug.speed('parsed')
         self._code_lines = parso.split_lines(source)
+        self._code = source
         line = max(len(self._code_lines), 1) if line is None else line
         if not (0 < line <= len(self._code_lines)):
             raise ValueError('`line` parameter is not in a valid range.')
@@ -141,7 +142,10 @@ class Script(object):
             if n is not None:
                 name = n
 
-        module = ModuleContext(self._evaluator, self._module_node, self.path)
+        module = ModuleContext(
+            self._evaluator, self._module_node, self.path,
+            code_lines=self._code_lines
+        )
         imports.add_module(self._evaluator, name, module)
         return module
 
@@ -374,7 +378,8 @@ class Interpreter(Script):
             self._evaluator,
             self._module_node,
             self.namespaces,
-            path=self.path
+            path=self.path,
+            code_lines=self._code_lines,
         )
 
 
diff --git a/jedi/api/classes.py b/jedi/api/classes.py
index 995ccf25..321b0e18 100644
--- a/jedi/api/classes.py
+++ b/jedi/api/classes.py
@@ -377,8 +377,7 @@ class BaseDefinition(object):
         if self.in_builtin_module():
             return ''
 
-        path = self._name.get_root_context().py__file__()
-        lines = parser_cache[self._evaluator.grammar._hashed][path].lines
+        lines = self._name.get_root_context().code_lines
 
         index = self._name.start_pos[0] - 1
         start_index = max(index - before, 0)
diff --git a/jedi/api/interpreter.py b/jedi/api/interpreter.py
index 365f88e9..c9b7bd69 100644
--- a/jedi/api/interpreter.py
+++ b/jedi/api/interpreter.py
@@ -21,15 +21,18 @@ class NamespaceObject(object):
 
 
 class MixedModuleContext(Context):
-    resets_positions = True
     type = 'mixed_module'
 
-    def __init__(self, evaluator, tree_module, namespaces, path):
+    def __init__(self, evaluator, tree_module, namespaces, path, code_lines):
         self.evaluator = evaluator
         self._namespaces = namespaces
 
         self._namespace_objects = [NamespaceObject(n) for n in namespaces]
-        self._module_context = ModuleContext(evaluator, tree_module, path=path)
+        self._module_context = ModuleContext(
+            evaluator, tree_module,
+            path=path,
+            code_lines=code_lines
+        )
         self.tree_node = tree_module
 
     def get_node(self):
@@ -50,5 +53,9 @@ class MixedModuleContext(Context):
             for filter in mixed_object.get_filters(*args, **kwargs):
                 yield filter
 
+    @property
+    def code_lines(self):
+        return self._module_context.code_lines
+
     def __getattr__(self, name):
         return getattr(self._module_context, name)
diff --git a/jedi/evaluate/compiled/mixed.py b/jedi/evaluate/compiled/mixed.py
index 6278dd8a..76366d55 100644
--- a/jedi/evaluate/compiled/mixed.py
+++ b/jedi/evaluate/compiled/mixed.py
@@ -5,6 +5,8 @@ Used only for REPL Completion.
 import inspect
 import os
 
+from jedi.parser_utils import get_cached_code_lines
+
 from jedi import settings
 from jedi.evaluate import compiled
 from jedi.cache import underscore_memoization
@@ -140,10 +142,10 @@ def _find_syntax_node_name(evaluator, access_handle):
         path = inspect.getsourcefile(python_object)
     except TypeError:
         # The type might not be known (e.g. class_with_dict.__weakref__)
-        return None, None, None
+        return None
     if path is None or not os.path.exists(path):
         # The path might not exist or be e.g. <stdin>.
-        return None, None, None
+        return None
 
     module_node = _load_module(evaluator, path)
 
@@ -151,22 +153,23 @@ def _find_syntax_node_name(evaluator, access_handle):
         # We don't need to check names for modules, because there's not really
         # a way to write a module in a module in Python (and also __name__ can
         # be something like ``email.utils``).
-        return module_node, module_node, path
+        code_lines = get_cached_code_lines(evaluator.grammar, path)
+        return module_node, module_node, path, code_lines
 
     try:
         name_str = python_object.__name__
     except AttributeError:
         # Stuff like python_function.__code__.
-        return None, None, None
+        return None
 
     if name_str == '<lambda>':
-        return None, None, None  # It's too hard to find lambdas.
+        return None  # It's too hard to find lambdas.
 
     # Doesn't always work (e.g. os.stat_result)
     try:
         names = module_node.get_used_names()[name_str]
     except KeyError:
-        return None, None, None
+        return None
     names = [n for n in names if n.is_definition()]
 
     try:
@@ -183,29 +186,36 @@ def _find_syntax_node_name(evaluator, access_handle):
         # There's a chance that the object is not available anymore, because
         # the code has changed in the background.
         if line_names:
-            return module_node, line_names[-1].parent, path
+            names = line_names
 
+    code_lines = get_cached_code_lines(evaluator.grammar, path)
     # It's really hard to actually get the right definition, here as a last
     # resort we just return the last one. This chance might lead to odd
     # completions at some points but will lead to mostly correct type
     # inference, because people tend to define a public name in a module only
     # once.
-    return module_node, names[-1].parent, path
+    return module_node, names[-1].parent, path, code_lines
 
 
 @compiled_objects_cache('mixed_cache')
 def _create(evaluator, access_handle, parent_context, *args):
-    module_node, tree_node, path = _find_syntax_node_name(evaluator, access_handle)
-
     compiled_object = create_cached_compiled_object(
         evaluator, access_handle, parent_context=parent_context.compiled_object)
-    if tree_node is None:
+
+    result = _find_syntax_node_name(evaluator, access_handle)
+    if result is None:
         return compiled_object
 
+    module_node, tree_node, path, code_lines = result
+
     if parent_context.tree_node.get_root_node() == module_node:
         module_context = parent_context.get_root_context()
     else:
-        module_context = ModuleContext(evaluator, module_node, path=path)
+        module_context = ModuleContext(
+            evaluator, module_node,
+            path=path,
+            code_lines=code_lines,
+        )
         # TODO this __name__ is probably wrong.
         name = compiled_object.get_root_context().py__name__()
         imports.add_module(evaluator, name, module_context)
diff --git a/jedi/evaluate/context/module.py b/jedi/evaluate/context/module.py
index cde8cac3..42dcbd92 100644
--- a/jedi/evaluate/context/module.py
+++ b/jedi/evaluate/context/module.py
@@ -43,10 +43,11 @@ class ModuleContext(TreeContext):
     api_type = u'module'
     parent_context = None
 
-    def __init__(self, evaluator, module_node, path):
+    def __init__(self, evaluator, module_node, path, code_lines):
         super(ModuleContext, self).__init__(evaluator, parent_context=None)
         self.tree_node = module_node
         self._path = path
+        self.code_lines = code_lines
 
     def get_filters(self, search_global, until_position=None, origin_scope=None):
         yield MergedFilter(
diff --git a/jedi/evaluate/imports.py b/jedi/evaluate/imports.py
index 5178b29d..8c9a726a 100644
--- a/jedi/evaluate/imports.py
+++ b/jedi/evaluate/imports.py
@@ -20,6 +20,7 @@ from parso import python_bytes_to_unicode
 from jedi._compatibility import unicode, ImplicitNSInfo, force_unicode
 from jedi import debug
 from jedi import settings
+from jedi.parser_utils import get_cached_code_lines
 from jedi.evaluate import sys_path
 from jedi.evaluate import helpers
 from jedi.evaluate import compiled
@@ -492,7 +493,11 @@ def _load_module(evaluator, path=None, code=None, sys_path=None,
                 cache_path=settings.cache_directory)
 
             from jedi.evaluate.context import ModuleContext
-            module = ModuleContext(evaluator, module_node, path=path)
+            module = ModuleContext(
+                evaluator, module_node,
+                path=path,
+                code_lines=get_cached_code_lines(evaluator.grammar, path),
+            )
         else:
             module = compiled.load_module(evaluator, path=path, sys_path=sys_path)
     add_module(evaluator, module_name, module, safe=safe_module_name)
diff --git a/jedi/evaluate/pep0484.py b/jedi/evaluate/pep0484.py
index e4b80e61..da0fa7e3 100644
--- a/jedi/evaluate/pep0484.py
+++ b/jedi/evaluate/pep0484.py
@@ -22,7 +22,7 @@ x support for type hint comments for functions, `# type: (int, str) -> int`.
 import os
 import re
 
-from parso import ParserSyntaxError, parse
+from parso import ParserSyntaxError, parse, split_lines
 from parso.python import tree
 
 from jedi._compatibility import unicode, force_unicode
@@ -216,6 +216,7 @@ def infer_return_types(function_context):
 
 
 _typing_module = None
+_typing_module_code_lines = None
 
 
 def _get_typing_replacement_module(grammar):
@@ -223,14 +224,15 @@ def _get_typing_replacement_module(grammar):
     The idea is to return our jedi replacement for the PEP-0484 typing module
     as discussed at https://github.com/davidhalter/jedi/issues/663
     """
-    global _typing_module
+    global _typing_module, _typing_module_code_lines
     if _typing_module is None:
         typing_path = \
             os.path.abspath(os.path.join(__file__, "../jedi_typing.py"))
         with open(typing_path) as f:
             code = unicode(f.read())
         _typing_module = grammar.parse(code)
-    return _typing_module
+        _typing_module_code_lines = split_lines(code)
+    return _typing_module, _typing_module_code_lines
 
 
 def py__getitem__(context, typ, node):
@@ -260,10 +262,12 @@ def py__getitem__(context, typ, node):
         # check for the instance typing._Optional (Python 3.6).
         return context.eval_node(nodes[0])
 
+    module_node, code_lines = _get_typing_replacement_module(context.evaluator.latest_grammar)
     typing = ModuleContext(
         context.evaluator,
-        module_node=_get_typing_replacement_module(context.evaluator.latest_grammar),
-        path=None
+        module_node=module_node,
+        path=None,
+        code_lines=code_lines,
     )
     factories = typing.py__getattribute__("factory")
     assert len(factories) == 1
diff --git a/jedi/evaluate/stdlib.py b/jedi/evaluate/stdlib.py
index 5f21a283..c702ed5b 100644
--- a/jedi/evaluate/stdlib.py
+++ b/jedi/evaluate/stdlib.py
@@ -11,6 +11,8 @@ compiled module that returns the types for C-builtins.
 """
 import re
 
+import parso
+
 from jedi._compatibility import force_unicode
 from jedi import debug
 from jedi.evaluate.arguments import ValuesArguments
@@ -293,8 +295,8 @@ def collections_namedtuple(evaluator, obj, arguments):
 
     base = next(iter(_class_template_set)).get_safe_value()
     base += _NAMEDTUPLE_INIT
-    # Build source
-    source = base.format(
+    # Build source code
+    code = base.format(
         typename=name,
         field_names=tuple(fields),
         num_fields=len(fields),
@@ -304,10 +306,13 @@ def collections_namedtuple(evaluator, obj, arguments):
                              for index, name in enumerate(fields))
     )
 
-    # Parse source
-    module = evaluator.grammar.parse(source)
+    # Parse source code
+    module = evaluator.grammar.parse(code)
     generated_class = next(module.iter_classdefs())
-    parent_context = ModuleContext(evaluator, module, '')
+    parent_context = ModuleContext(
+        evaluator, module, None,
+        code_lines=parso.split_lines(code),
+    )
     return ContextSet(ClassContext(evaluator, parent_context, generated_class))
 
 
diff --git a/jedi/evaluate/sys_path.py b/jedi/evaluate/sys_path.py
index 7fa9beef..d765a665 100644
--- a/jedi/evaluate/sys_path.py
+++ b/jedi/evaluate/sys_path.py
@@ -5,6 +5,7 @@ from jedi.evaluate.cache import evaluator_method_cache
 from jedi.evaluate.base_context import ContextualizedNode
 from jedi.evaluate.helpers import is_string
 from jedi.common.utils import traverse_parents
+from jedi.parser_utils import get_cached_code_lines
 from jedi import settings
 from jedi import debug
 
@@ -150,7 +151,10 @@ def _get_paths_from_buildout_script(evaluator, buildout_script_path):
         return
 
     from jedi.evaluate.context import ModuleContext
-    module = ModuleContext(evaluator, module_node, buildout_script_path)
+    module = ModuleContext(
+        evaluator, module_node, buildout_script_path,
+        code_lines=get_cached_code_lines(evaluator.grammar, buildout_script_path),
+    )
     for path in check_sys_path_modifications(module):
         yield path
 
diff --git a/jedi/parser_utils.py b/jedi/parser_utils.py
index 990e6cca..e6302653 100644
--- a/jedi/parser_utils.py
+++ b/jedi/parser_utils.py
@@ -1,8 +1,10 @@
 import textwrap
 from inspect import cleandoc
 
-from jedi._compatibility import literal_eval, force_unicode
 from parso.python import tree
+from parso.cache import parser_cache
+
+from jedi._compatibility import literal_eval, force_unicode
 
 _EXECUTE_NODES = {'funcdef', 'classdef', 'import_from', 'import_name', 'test',
                   'or_test', 'and_test', 'not_test', 'comparison', 'expr',
@@ -238,3 +240,11 @@ def get_parent_scope(node, include_flows=False):
             break
         scope = scope.parent
     return scope
+
+
+def get_cached_code_lines(grammar, path):
+    """
+    Basically access the cached code lines in parso. This is not the nicest way
+    to do this, but we avoid splitting all the lines again.
+    """
+    return parser_cache[grammar._hashed][path].lines
diff --git a/test/test_evaluate/test_stdlib.py b/test/test_evaluate/test_stdlib.py
index d2252fb0..ff49f89a 100644
--- a/test/test_evaluate/test_stdlib.py
+++ b/test/test_evaluate/test_stdlib.py
@@ -71,3 +71,22 @@ def test_nested_namedtuples(Script):
         train_x.train.'''
     ))
     assert 'data' in [c.name for c in s.completions()]
+
+
+def test_namedtuple_goto_definitions(Script):
+    source = dedent("""
+        from collections import namedtuple
+
+        Foo = namedtuple('Foo', 'id timestamp gps_timestamp attributes')
+        Foo""")
+
+    from jedi.api import Script
+
+    lines = source.split("\n")
+    d1, = Script(source).goto_definitions()
+
+    print(d1)
+    print(d1.line)
+    print(d1.module_path)
+    print(d1.get_line_code())
+    assert d1.get_line_code() == lines[-1]