diff --git a/lib/plugins/gcs/index.js b/lib/plugins/gcs/index.js
index f9eb957627..a52d0b3a31 100644
--- a/lib/plugins/gcs/index.js
+++ b/lib/plugins/gcs/index.js
@@ -81,7 +81,7 @@ async function uploadFile(
     gzip: !!gcsOptions.gzip,
     metadata: {
         // eslint-disable-next-line unicorn/numeric-separators-style
-        cacheControl: 'public, max-age=' + noCacheTime ? 0 : 31536000
+        cacheControl: 'public, max-age=' + (noCacheTime ? 0 : 31536000)
     }
   };