diff --git a/lib/install.js b/lib/install.js
index 960922d..757fc83 100644
--- a/lib/install.js
+++ b/lib/install.js
@@ -158,7 +158,7 @@ function install (gyp, argv, callback) {
         // invalid
         log.silly('tarball', 'ignoring from tarball:', name)
       }
-      return _valid
+      return isValid
     }
 
     gunzip.on('error', cb)