diff --git a/tests/test_images.sh b/tests/test_images.sh
index 6d305d1e4..13e942332 100755
--- a/tests/test_images.sh
+++ b/tests/test_images.sh
@@ -120,7 +120,7 @@ show_stats()
 		"Type" \
 		"Name"
 
-	sort -k1,1n "$tmpfile"
+	sort -k1,1n -k3,3n "$tmpfile"
 
 	rm -f "${tmpfile}"
 }