diff --git a/mysite/customs/forms.py b/mysite/customs/forms.py
index 4af39aeb0d..d166772da3 100644
--- a/mysite/customs/forms.py
+++ b/mysite/customs/forms.py
@@ -143,7 +143,7 @@ def save(self, *args, **kwargs):
 
 class GitHubTrackerForm(TrackerFormThatHidesCreatedForProject):
     github_url = django.forms.RegexField(
-        regex=r'^https?:\/\/github.com\/[a-zA-Z0-9\-]+\/[\-\w.]+$',
+        regex=r'^https?:\/\/github.com\/[a-zA-Z0-9\-]+\/[\-\w.]+[/]?$',
         max_length=200,
         required=True,
         help_text='This is the url of the GitHub project.',