diff --git a/jedi/evaluate/docstrings.py b/jedi/evaluate/docstrings.py
index 4b98fa73..1b7db0da 100644
--- a/jedi/evaluate/docstrings.py
+++ b/jedi/evaluate/docstrings.py
@@ -23,10 +23,8 @@ from jedi.common import unite
 from jedi.evaluate import context
 from jedi.evaluate.cache import memoize_default
 from jedi.parser.python import parse
-from jedi.parser.python.tree import search_ancestor
 from jedi.common import indent_block
 from jedi.evaluate.iterable import SequenceLiteralContext, FakeSequence
-from jedi.parser_utils import clean_scope_docstring
 
 
 DOCSTRING_PARAM_PATTERNS = [
@@ -186,22 +184,25 @@ def _execute_array_values(evaluator, array):
 
 
 @memoize_default()
-def infer_param(module_context, param):
+def infer_param(execution_context, param):
+    from jedi.evaluate.instance import InstanceFunctionExecution
+
     def eval_docstring(docstring):
         return set(
             p
             for param_str in _search_param_in_docstr(docstring, param.name.value)
             for p in _evaluate_for_statement_string(module_context, param_str)
         )
+    module_context = execution_context.get_root_context()
     func = param.get_parent_function()
     if func.type == 'lambdef':
         return set()
 
-    types = eval_docstring(clean_scope_docstring(func))
-    if func.name.value == '__init__':
-        cls = search_ancestor(func, 'classdef')
-        if cls is not None:
-            types |= eval_docstring(clean_scope_docstring(cls))
+    types = eval_docstring(execution_context.py__doc__())
+    if isinstance(execution_context, InstanceFunctionExecution) and \
+            execution_context.function_context.name.string_name == '__init__':
+        class_context = execution_context.instance.class_context
+        types |= eval_docstring(class_context.py__doc__())
 
     return types
 
diff --git a/jedi/evaluate/param.py b/jedi/evaluate/param.py
index ef1bcf79..a2c09b5f 100644
--- a/jedi/evaluate/param.py
+++ b/jedi/evaluate/param.py
@@ -215,9 +215,8 @@ class ExecutedParam(object):
         self.string_name = param_node.name.value
 
     def infer(self):
-        root_context = self._execution_context.get_root_context()
-        pep0484_hints = pep0484.infer_param(root_context, self._param_node)
-        doc_params = docstrings.infer_param(root_context, self._param_node)
+        pep0484_hints = pep0484.infer_param(self._execution_context, self._param_node)
+        doc_params = docstrings.infer_param(self._execution_context, self._param_node)
         if pep0484_hints or doc_params:
             return list(set(pep0484_hints) | set(doc_params))
 
diff --git a/jedi/evaluate/pep0484.py b/jedi/evaluate/pep0484.py
index f44e88b3..be784007 100644
--- a/jedi/evaluate/pep0484.py
+++ b/jedi/evaluate/pep0484.py
@@ -80,9 +80,10 @@ def _fix_forward_reference(context, node):
 
 
 @memoize_default()
-def infer_param(context, param):
+def infer_param(execution_context, param):
     annotation = param.annotation
-    return _evaluate_for_annotation(context, annotation)
+    module_context = execution_context.get_root_context()
+    return _evaluate_for_annotation(module_context, annotation)
 
 
 def py__annotations__(funcdef):