diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fd92792714e338f74c66a4cec7822686644bac89..cfaf778375770be20b16deabdc52e44694892f1e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,6 +19,8 @@ jobs:
   tests:
     name: Run tests
     runs-on: self-hosted
+    env:
+      RUSTFLAGS: -D warnings
     steps:
       - name: Install Rust
         uses: actions-rs/toolchain@v1