diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 73f79bee4695..a9495961d698 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -444,7 +444,7 @@ let
       n=$out${destination}
       mkdir -p "$(dirname "$n")"
       echo -n "$text" > "$n"
-      test -n "$executable" && chmod +x "$n"
+      (test -n "$executable" && chmod +x "$n") || true
     '';
     
   # Shorthands for `writeTextFile'.