diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index 47076986..fd055153 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -51,7 +51,7 @@ jobs:
         mix local.hex --force
         mix deps.get
     - name: Compile (warnings as errors)
-      run: mix compile --force
+      run: mix compile --force --warnings-as-errors
     - name: Check formatting
       run: mix format --check-formatted
     - name: Credo