diff --git a/scripts/post-contribution-message.py b/scripts/post-contribution-message.py
index b37e483d..856a0fbc 100644
--- a/scripts/post-contribution-message.py
+++ b/scripts/post-contribution-message.py
@@ -64,7 +64,7 @@
     "exercises_source": {{
         "username": "{FORK_AUTHOR}",
         "repository": "{FORK_REPO}",
-        "branch": "{FORK_BRANCH}",
+        "branch": "{FORK_BRANCH}"
     }}
 }}
 ```