diff --git a/ci/check-commit-format.sh b/ci/check-commit-format.sh
index 982122a8..8b1a4247 100755
--- a/ci/check-commit-format.sh
+++ b/ci/check-commit-format.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 REPO_ROOT=$(git rev-parse --show-toplevel)
-RESULT=`python $REPO_ROOT/ci/git-clang-format.py --diff -f --commit HEAD~1`
+RESULT=`python $REPO_ROOT/ci/git-clang-format.py --diff -f --commit HEAD~1 --extensions "h,hpp,cpp"`
 if [ "$RESULT" != "no modified files to format" ] && [ "$RESULT" != "clang-format did not modify any files" ]; then
     python $REPO_ROOT/ci/git-clang-format.py --diff -f --commit HEAD~1
     echo