diff --git a/.github/workflows/code-quality.yml b/.github/workflows/code-quality.yml
index ef0144d..4c32cbd 100644
--- a/.github/workflows/code-quality.yml
+++ b/.github/workflows/code-quality.yml
@@ -14,7 +14,7 @@ jobs:
     - run: cmake-format --check $(git ls-files | grep -E "(CMakeLists.txt|\.cmake)$")
     - run: cmake -B ${{github.workspace}}/build
     - run: cmake --build build -t iwyu
-    - run: git ls-files | grep -E "\.(hpp|cpp)$" | xargs clang-tidy -p ${{github.workspace}}/build --extra-arg="-std=c++17" --extra-arg="-I${{github.workspace}}/include" --use-color
+    - run: git ls-files | grep -E "\.cpp$" | xargs clang-tidy -p ${{github.workspace}}/build --extra-arg="-std=c++17" --extra-arg="-I${{github.workspace}}/include" --use-color
   check-gcc-11:
     runs-on: ubuntu-latest
     steps: