diff --git a/dist/tools/cppcheck/check.sh b/dist/tools/cppcheck/check.sh
index c2d153bf43..b79884fafb 100755
--- a/dist/tools/cppcheck/check.sh
+++ b/dist/tools/cppcheck/check.sh
@@ -17,7 +17,7 @@ else
 fi
 
 BRANCH=${1}
-FILEREGEX='\.([sScHh]|cpp)$'
+FILEREGEX='\.([CcHhSs]|[ch]pp)$'
 EXCLUDE='^(cpu/saml21/include/atmel/)|^(cpu/cortexm_common/include/)'
 
 # If no branch but an option is given, unset BRANCH.