diff --git a/dist/tools/cppcheck/check.sh b/dist/tools/cppcheck/check.sh
index 81c8d13513..e33d97d534 100755
--- a/dist/tools/cppcheck/check.sh
+++ b/dist/tools/cppcheck/check.sh
@@ -17,7 +17,7 @@ else
 fi
 
 BRANCH=${1}
-FILEREGEX='\.([CcHhSs]|[ch]pp)$'
+FILEREGEX='\.([CcHh]|[ch]pp)$'
 EXCLUDE='^(.+/include/vendor/)'
 
 # If no branch but an option is given, unset BRANCH.