diff --git a/progit/lib/__init__.py b/progit/lib/__init__.py
index 1ee9015..018f392 100644
--- a/progit/lib/__init__.py
+++ b/progit/lib/__init__.py
@@ -912,7 +912,7 @@ def update_git_ticket(issue, repo, ticketfolder):
 
     # Write down what changed
     with open(file_path, 'w') as stream:
-        stream.write(issue_to_json(issue))
+        stream.write(issue.to_json())
 
     # Retrieve the list of files that changed
     diff = new_repo.diff()