diff --git a/tests/prepare_commit_msg_test.py b/tests/prepare_commit_msg_test.py
index f991b21..a997139 100644
--- a/tests/prepare_commit_msg_test.py
+++ b/tests/prepare_commit_msg_test.py
@@ -26,6 +26,12 @@ TESTS = (
         'test',  # this should not trigger anything
         'prepare_commit_msg_prepend.j2',
     ),
+    (
+        b'',
+        b'',
+        'master',  # this should not trigger anything
+        'prepare_commit_msg_prepend.j2',
+    ),
     (
         b'',
         b'[1.0.0] ',