diff --git a/shells/zephyr/default.nix b/shells/zephyr/default.nix
index 894fa59..9eee9e1 100644
--- a/shells/zephyr/default.nix
+++ b/shells/zephyr/default.nix
@@ -2,7 +2,7 @@
 , toolchains ? with zephyr.toolchains; [ arm-zephyr-eabi ], enableWest ? false
 , zephyrSrc ? null, extraPackages ? [ ], extraAttrs ? { } }:
 let zephyr-sdk = zephyr.sdk.override { inherit toolchains; };
-in mkShell {
+in mkShell ({
   packages = [ cmake ninja gnumake python3 ] ++ (with python3.pkgs;
     [
       # requirements-base.txt
@@ -27,4 +27,4 @@ in mkShell {
   shellHook = ''
     PATH="${zephyrSrc}/scripts:$PATH"
   '';
-} // extraAttrs
+} // extraAttrs)