diff --git a/.github/workflows/build-nix.yml b/.github/workflows/build-nix.yml
index 1bdac99..8138dd1 100644
--- a/.github/workflows/build-nix.yml
+++ b/.github/workflows/build-nix.yml
@@ -9,3 +9,5 @@ on:
 jobs:
   build:
     uses: urob/zmk-actions/.github/workflows/build-user-config.yml@main
+    with:
+      toolchain: zephyr # gnuarmemb or zephyr