diff --git a/.clang-tidy b/.clang-tidy
index de69285..5fca7ce 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -303,7 +303,7 @@
 readability-uppercase-literal-suffix'
 
 WarningsAsErrors: '*'
-HeaderFilterRegex: '.*'
+HeaderFilterRegex: '.*.hpp'
 
 CheckOptions:
   - { key: readability-identifier-naming.ClassCase,     value: CamelCase  }