diff --git a/nix/packages.nix b/nix/packages.nix
index 2acd3b9449..7d3e3dff23 100644
--- a/nix/packages.nix
+++ b/nix/packages.nix
@@ -2,7 +2,7 @@
 with pkgs;
 let
   nix-pinned = writeShellScriptBin "nix" ''
-    ${nix.defaultPackage.${system}}/bin/nix --experimental-features 'nix-command flakes' --extra-substituters https://lean4.cachix.org/ --option warn-dirty false $@
+    ${nix.defaultPackage.${system}}/bin/nix --experimental-features 'nix-command flakes' --extra-substituters https://lean4.cachix.org/ --option warn-dirty false "$@"
   '';
   llvmPackages = llvmPackages_10;
   cc = ccacheWrapper.override rec {