diff --git a/Lib/test/re_tests.py b/Lib/test/re_tests.py
index 3a25d51..bb72f3d 100755
--- a/Lib/test/re_tests.py
+++ b/Lib/test/re_tests.py
@@ -615,4 +615,6 @@
     # bug 112468
     ('(', '', SYNTAX_ERROR),
     ('[\\41]', '!', SUCCEED, 'found', '!'),
+    # bug 115618
+    (r'(?<!abc)(d.f)', 'abcdefdof', SUCCEED, 'found', 'dof'),
 ]