diff --git a/parso/python/diff.py b/parso/python/diff.py
index 6c119e5..2dcf027 100644
--- a/parso/python/diff.py
+++ b/parso/python/diff.py
@@ -682,6 +682,8 @@ class _NodesTree(object):
                 last = new_nodes[-1]
                 if last.type == 'decorated':
                     last = last.children[-1]
+                if last.type in ('async_funcdef', 'async_stmt'):
+                    last = last.children[-1]
                 last_line_offset_leaf = last.children[-2].get_last_leaf()
                 assert last_line_offset_leaf == ':'
             else:
diff --git a/test/test_diff_parser.py b/test/test_diff_parser.py
index a7a9799..63050e5 100644
--- a/test/test_diff_parser.py
+++ b/test/test_diff_parser.py
@@ -1267,3 +1267,20 @@ def test_x(differ):
     differ.parse(code2, copies=ANY, parsers=ANY, expect_error_leaves=True)
     differ.parse(code3, copies=ANY, parsers=ANY, expect_error_leaves=True)
     differ.parse(code1, copies=1)
+
+
+@pytest.mark.skipif(sys.version_info < (3, 5), reason="Async starts working in 3.5")
+def test_async_copy(differ):
+    code1 = dedent('''\
+        async def main():
+            x = 3
+            print(
+        ''')
+    code2 = dedent('''\
+        async def main():
+            x = 3
+            print()
+        ''')
+    differ.initialize(code1)
+    differ.parse(code2, copies=1, parsers=1)
+    differ.parse(code1, copies=1, parsers=1, expect_error_leaves=True)