diff --git a/maintainer-scripts/branch_changer.py b/maintainer-scripts/branch_changer.py
index d7954361752..6eb453679b8 100755
--- a/maintainer-scripts/branch_changer.py
+++ b/maintainer-scripts/branch_changer.py
@@ -142,7 +142,7 @@ class Bug:
             return False
 
     def serialize_summary(self):
-        assert not self.versions
+        assert self.versions
         assert self.is_regression
 
         new_version = '/'.join(self.versions)