diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cbe7107..2556dc4 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -52,3 +52,5 @@ jobs:
 
     - name: Test nix-build
       run: nix-build
+      env:
+        NIX_PATH: nixpkgs=channel:nixpkgs-unstable