diff --git a/lib/util/cache.js b/lib/util/cache.js
index 35c53512b2acea09657b888e42dbfd04e45d7dbe..6ebce36bf7f3c50d6afabe5b3ab0e692605403dd 100644
--- a/lib/util/cache.js
+++ b/lib/util/cache.js
@@ -270,8 +270,6 @@ function parseVaryHeader (varyHeader, headers) {
 
     if (headers[trimmedHeader]) {
       output[trimmedHeader] = headers[trimmedHeader]
-    } else {
-      return undefined
     }
   }