diff --git a/pkgs/development/web/nodejs/build-node-package.nix b/pkgs/development/web/nodejs/build-node-package.nix
index 544634626b03..7341bbd60f79 100644
--- a/pkgs/development/web/nodejs/build-node-package.nix
+++ b/pkgs/development/web/nodejs/build-node-package.nix
@@ -8,7 +8,7 @@ let
   npmFlags = concatStringsSep " " (map (v: "--${v}") flags);
 
   sources = runCommand "node-sources" {} ''
-    tar --no-same-owner -xf ${nodejs.src}
+    tar --no-same-owner --no-same-permissions -xf ${nodejs.src}
     mv *node* $out
   '';