diff --git a/.clang-tidy b/.clang-tidy
index d0b28f4..7d0c827 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -18,4 +18,4 @@ CheckOptions:
   - { key: readability-identifier-naming.StructIgnoredRegexp, value: "parse_number" }
   - { key: readability-identifier-naming.VariableCase, value: lower_case }
 
-HeaderFilterRegex: '.*'
+HeaderFilterRegex: 'argparse/.+\.hpp'