diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 74cf294c..20e6509f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -5,18 +5,6 @@ env:
   NIXPKGS_ALLOW_BROKEN: "1"
   NIXPKGS_ALLOW_UNFREE: "1"
 jobs:
-  check-outputs:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: cachix/install-nix-action@v16
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-          extra_nix_config: |
-            keep-going = true
-      - name: Check flake outputs
-        run: nix flake check --impure
-
   build-custom-packages:
     runs-on: ubuntu-latest
     steps:
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
new file mode 100644
index 00000000..6b2429c8
--- /dev/null
+++ b/.github/workflows/check.yml
@@ -0,0 +1,19 @@
+name: "Check flake outputs"
+on: [pull_request, push]
+env:
+  NIXPKGS_ALLOW_INSECURE: "1"
+  NIXPKGS_ALLOW_BROKEN: "1"
+  NIXPKGS_ALLOW_UNFREE: "1"
+jobs:
+  check-outputs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: cachix/install-nix-action@v16
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+          extra_nix_config: |
+            keep-going = true
+      - name: Check flake outputs
+        run: nix flake check --impure
+