diff --git a/jedi/api/helpers.py b/jedi/api/helpers.py
index 4086ba10..7d6606f2 100644
--- a/jedi/api/helpers.py
+++ b/jedi/api/helpers.py
@@ -132,7 +132,7 @@ def get_stack_at_position(grammar, code_lines, module_node, pos):
     safeword = 'ZZZ_USER_WANTS_TO_COMPLETE_HERE_WITH_JEDI'
     code = code + safeword
 
-    p = Parser(grammar, code, error_recovery=True)
+    p = Parser(grammar, error_recovery=True)
     try:
         p.parse(tokens=tokenize_without_endmarker(code))
     except EndMarkerReached:
diff --git a/jedi/parser/python/__init__.py b/jedi/parser/python/__init__.py
index 6b5fa739..9b7ca75f 100644
--- a/jedi/parser/python/__init__.py
+++ b/jedi/parser/python/__init__.py
@@ -111,7 +111,7 @@ def parse(code=None, path=None, grammar=None, error_recovery=True,
 
     tokens = generate_tokens(tokenize_lines, use_exact_op_types=True)
 
-    p = Parser(grammar, code, error_recovery=error_recovery, start_symbol=start_symbol)
+    p = Parser(grammar, error_recovery=error_recovery, start_symbol=start_symbol)
     root_node = p.parse(tokens=tokens)
     if added_newline:
         _remove_last_newline(root_node)
diff --git a/jedi/parser/python/diff.py b/jedi/parser/python/diff.py
index 13fb0a14..3da9809d 100644
--- a/jedi/parser/python/diff.py
+++ b/jedi/parser/python/diff.py
@@ -372,7 +372,6 @@ class DiffParser(object):
         )
         self._active_parser = Parser(
             self._grammar,
-            source='\n',
             error_recovery=True
         )
         return self._active_parser.parse(tokens=tokens)
diff --git a/jedi/parser/python/parser.py b/jedi/parser/python/parser.py
index 4627a237..0c8da560 100644
--- a/jedi/parser/python/parser.py
+++ b/jedi/parser/python/parser.py
@@ -13,7 +13,6 @@ class Parser(BaseParser):
     class structure of different scopes.
 
     :param grammar: The grammar object of pgen2. Loaded by load_grammar.
-    :param source: The codebase for the parser. Must be unicode.
     """
 
     node_map = {
@@ -47,12 +46,9 @@ class Parser(BaseParser):
     }
     default_node = tree.PythonNode
 
-    def __init__(self, grammar, source, error_recovery=True, start_symbol='file_input'):
+    def __init__(self, grammar, error_recovery=True, start_symbol='file_input'):
         super(Parser, self).__init__(grammar, start_symbol, error_recovery=error_recovery)
 
-        self.source = source
-        self.new_code = source
-
         self.syntax_errors = []
         self._omit_dedent_list = []
         self._indent_counter = 0