diff --git a/gulpfile.js b/gulpfile.js
index 653a5f5..584cc9a 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -144,7 +144,9 @@ gulp.task("generate sprites", ["resize lg"], function() {
     //template: "./client/scss/_cards.hbs"
   })
   .pipe(imagemin())
-  .pipe(gulpif("*.png", rename({
+  .pipe(gulpif(function (file) {
+    return file.path.match(".*\\.png$") != null;
+  }, rename({
     extname: ".PNG"
   })))
   .pipe(gulp.dest("./public/build/"));