diff --git a/.clang-format b/.clang-format
index 72bcff11e269f4d82303c102c27e1669d1a6fdca..28c73fe0e92ceef60fb45295a94cbc4c5637965c 100644
--- a/.clang-format
+++ b/.clang-format
@@ -98,6 +98,8 @@ IncludeCategories:
     Priority:        4
   - Regex:           '^("|<)boost'
     Priority:        5
+  - Regex:           '^<.*[^\.]h>'
+    Priority:        6
   - Regex:           '^<.*[^\.h]>'
     Priority:        6
   - Regex:           '^<.*>'