diff --git a/shells/zephyr/default.nix b/shells/zephyr/default.nix
index 9eee9e1..91cd3c6 100644
--- a/shells/zephyr/default.nix
+++ b/shells/zephyr/default.nix
@@ -1,6 +1,7 @@
 { lib, mkShell, zephyr, cmake, ninja, gnumake, python3
 , toolchains ? with zephyr.toolchains; [ arm-zephyr-eabi ], enableWest ? false
-, zephyrSrc ? null, extraPackages ? [ ], extraAttrs ? { } }:
+, zephyrSrc ? zephyr.src, modules ? [ ], extraPackages ? [ ], extraAttrs ? { }
+}:
 let zephyr-sdk = zephyr.sdk.override { inherit toolchains; };
 in mkShell ({
   packages = [ cmake ninja gnumake python3 ] ++ (with python3.pkgs;
@@ -27,4 +28,6 @@ in mkShell ({
   shellHook = ''
     PATH="${zephyrSrc}/scripts:$PATH"
   '';
+} // lib.optionalAttrs (modules != [ ]) {
+  ZEPHYR_MODULES = lib.concatStringsSep ";" (map (pkg: pkg.out) modules);
 } // extraAttrs)