diff --git a/.github/workflows/scripts/format_cpp.sh b/.github/workflows/scripts/format_cpp.sh
index 93b1df4c9..94ac93cb3 100755
--- a/.github/workflows/scripts/format_cpp.sh
+++ b/.github/workflows/scripts/format_cpp.sh
@@ -4,7 +4,7 @@ set -e -o pipefail
 
 EXCLUDE_DIRS="-path ./compiler/include/boost-single-header -prune -o"
 
-find ./compiler/{include,lib,src} $EXCLUDE_DIRS -iregex '^.*\.\(cpp\|cc\|h\|hpp\)$' -print | xargs clang-format -i -style='file'
+find ./compiler/{include,lib,src,tests} $EXCLUDE_DIRS -iregex '^.*\.\(cpp\|cc\|h\|hpp\)$' -print | xargs clang-format -i -style='file'
 
 # show changes if any
 git --no-pager diff