diff --git a/scripts/manifest_check.py b/scripts/manifest_check.py
index 71fe358ff..b4936b865 100755
--- a/scripts/manifest_check.py
+++ b/scripts/manifest_check.py
@@ -358,7 +358,7 @@ def main():
             # the check has failed.
             if args.enforce_uses_libraries_status:
                 with open(args.enforce_uses_libraries_status, 'w') as f:
-                    if not errmsg is not None:
+                    if errmsg is not None:
                         f.write('%s\n' % errmsg)
 
         if args.extract_target_sdk_version: