diff --git a/merge_into_manifest.py b/merge_into_manifest.py
index 37205cf7f31f3f7364dd1ba5e10d96c11090bb73..f29cd76e79ca79eaf70f026eb4c825d06f338cd9 100755
--- a/merge_into_manifest.py
+++ b/merge_into_manifest.py
@@ -61,7 +61,7 @@ def merge_into_manifest(
         manifest_project, integration_branch, target_branch
     )
     if not created:
-        sys.exit("ERROR: There is already an open merge request:\n%s" % mrs[0].web_url)
+        sys.exit("ERROR: There is already an open merge request:\n%s" % mr.web_url)
 
     print("Created new merge request:")
     print(mr.web_url)