diff --git a/.github/actions/run_tests/action.yml b/.github/actions/run_tests/action.yml
index de5eadb61a..8c1e09ee74 100644
--- a/.github/actions/run_tests/action.yml
+++ b/.github/actions/run_tests/action.yml
@@ -22,13 +22,9 @@ runs:
       run: script/clear-target-dir-if-larger-than 70
 
     - name: Run check
-      env:
-        RUSTFLAGS: -D warnings
       shell: bash -euxo pipefail {0}
       run: cargo check --tests --workspace
 
     - name: Run tests
-      env:
-        RUSTFLAGS: -D warnings
       shell: bash -euxo pipefail {0}
       run: cargo nextest run --workspace --no-fail-fast
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 65475a41b9..482e1c51f3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,6 +23,9 @@ jobs:
       - self-hosted
       - test
     steps:
+      - name: Set up default .cargo/config.toml
+	run: echo "[build]\nrustflags = [\"-D\", \"warnings\"]" > $HOME/.cargo/config.toml
+
       - name: Checkout repo
         uses: actions/checkout@v3
         with: