diff --git a/.clang-tidy b/.clang-tidy
index bdf15ab..ed48b96 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -287,7 +287,7 @@
 readability-uppercase-literal-suffix'
 
 WarningsAsErrors: '*'
-HeaderFilterRegex: '.*'
+HeaderFilterRegex: '(?!^subprojects).*'
 CheckOptions:
   - { key: readability-identifier-naming.ClassCase,     value: CamelCase  }
   - { key: readability-identifier-naming.VariableCase,  value: camelBack }