diff --git a/src/PrestissimoFileFetcher.php b/src/PrestissimoFileFetcher.php
index a1f8e70..af1ae72 100644
--- a/src/PrestissimoFileFetcher.php
+++ b/src/PrestissimoFileFetcher.php
@@ -73,6 +73,9 @@ protected function fetchWithPrestissimo($version, $destination, $override) {
         }
       }
     } while ($multi->remain());
+    if ($failureCnt > 0) {
+       throw new \Exception("$failureCnt drupal scaffold files could not be downloaded");
+    }
   }
 
 }