diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2dfbeef4..27437f93 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,6 +19,8 @@ jobs:
       run: rustup component add clippy
     - if: matrix.rust != 'nightly'
       run: cargo clippy --all-features -- -D warnings
+    - if: matrix.rust == 'stable' && matrix.os == 'ubuntu-latest'
+      run: cargo fmt --all -- --check
     - run: cargo build --no-default-features --verbose
     - run: cargo test --features="master resolv resolv-sync sign tsig validate" --verbose