diff --git a/etc/ci/check_no_unwrap.sh b/etc/ci/check_no_unwrap.sh
index e70fa31192a..2d949cd591c 100755
--- a/etc/ci/check_no_unwrap.sh
+++ b/etc/ci/check_no_unwrap.sh
@@ -13,4 +13,8 @@ FILES=("components/compositing/compositor.rs"
        "components/compositing/pipeline.rs"
        "components/constellation/constellation.rs")
 
-! grep -n "unwrap(\|panic!(" "${FILES[@]}"
+# make sure the files exist
+ls -1 "${FILES[@]}"
+
+# make sure the files do not contain "unwrap" or "panic!"
+! grep --line-number --with-filename "unwrap(\|panic!(" "${FILES[@]}"