diff --git a/lib/cli/lookup-files.js b/lib/cli/lookup-files.js
index 8c5c9f3fe7..81e9c261e3 100644
--- a/lib/cli/lookup-files.js
+++ b/lib/cli/lookup-files.js
@@ -46,7 +46,7 @@ function isHiddenOnUnix(pathname) {
  */
 function hasMatchingExtname(pathname, exts) {
   return exts.some(function(element) {
-    return pathname.endsWith(element);
+    return pathname.endsWith('.' + element);
   });
 }