diff --git a/poky/scripts/gen-lockedsig-cache b/poky/scripts/gen-lockedsig-cache
index cd8f9a4..cc674f9 100755
--- a/poky/scripts/gen-lockedsig-cache
+++ b/poky/scripts/gen-lockedsig-cache
@@ -94,8 +94,7 @@
 print('Processing files')
 for f in files:
     sys.stdout.write('Processing %s... ' % f)
-    _, ext = os.path.splitext(f)
-    if not ext in ['.tgz', '.siginfo', '.sig']:
+    if not f.endswith(('.tar.zst', '.siginfo', '.sig')):
         # Most likely a temp file, skip it
         print('skipping')
         continue