diff --git a/grunt/config/compare_size.js b/grunt/config/compare_size.js
index e785fe5281..fb59d94cdb 100644
--- a/grunt/config/compare_size.js
+++ b/grunt/config/compare_size.js
@@ -12,6 +12,6 @@ module.exports = {
         return gzip.zip(contents, {}).length;
       }
     },
-    cache: "build/.sizecache.json"
+    cache: ".grunt/sizecache.json"
   }
 };