diff --git a/jedi/parser/python/__init__.py b/jedi/parser/python/__init__.py
index c3085a40..0488be09 100644
--- a/jedi/parser/python/__init__.py
+++ b/jedi/parser/python/__init__.py
@@ -100,6 +100,7 @@ def parse(code=None, path=None, grammar=None, error_recovery=True,
         kwargs = dict(start_symbol=start_symbol)
         parser = Parser
     # TODO add recovery
+    p = None
     if diff_cache:
         try:
             parser_cache_item = utils.parser_cache[path]
@@ -111,12 +112,16 @@ def parse(code=None, path=None, grammar=None, error_recovery=True,
             new_node = DiffParser(p).update(lines)
             p._parsed = new_node
             utils.save_parser(grammar, path, p, pickling=False)
+            if added_newline:
+                p.source = code[:-1]
+                _remove_last_newline(new_node)
             return new_node
     p = parser(grammar, code, start_parsing=False, **kwargs)
-    module = p.parse(tokens=tokens)
+    new_node = p.parse(tokens=tokens)
     if added_newline:
-        _remove_last_newline(module)
+        p.source = code[:-1]
+        _remove_last_newline(new_node)
 
     if use_cache or diff_cache:
         utils.save_parser(grammar, path, p)
-    return module
+    return new_node
diff --git a/jedi/parser/python/diff.py b/jedi/parser/python/diff.py
index ceb7e77d..c1fb2898 100644
--- a/jedi/parser/python/diff.py
+++ b/jedi/parser/python/diff.py
@@ -206,10 +206,6 @@ class DiffParser(object):
         debug.speed('diff parser calculated')
         debug.dbg('diff: line_lengths old: %s, new: %s' % (len(lines_old), line_length))
 
-        if len(opcodes) == 1 and opcodes[0][0] == 'equal':
-            self._copy_count = 1
-            return self._module
-
         for operation, i1, i2, j1, j2 in opcodes:
             debug.dbg('diff %s old[%s:%s] new[%s:%s]',
                       operation, i1 + 1, i2, j1 + 1, j2)