diff --git a/.class-clang-format b/.class-clang-format
index 432cf2e..c1015e1 100644
--- a/.class-clang-format
+++ b/.class-clang-format
@@ -7,7 +7,7 @@ SortIncludes: true
 IncludeBlocks: Regroup
 IncludeCategories:
   # System headers from C
-  - Regex:           '<(cassert|ccomplex|cctype|cerrno|cfenv|cfloat|cinttypes|ciso646|climits|clocale|cmath|csetjmp|csignal|cstdalign|cstdarg|cstdatomic|cstdbool|cstddef|cstdint|cstdio|cstdlib|cstdnoreturn|cstring|ctgmath|cthreads|ctime|cuchar|cwchar|cwctype)>'
+  - Regex:           '<c(assert|complex|ctype|errno|fenv|float|inttypes|iso646|limits|locale|math|setjmp|signal|stdalign|stdarg|stdatomic|stdbool|stddef|stdint|stdio|stdlib|stdnoreturn|string|tgmath|threads|time|uchar|wchar|wctype)>'
     Priority:        3
   # System headers without extension.
   - Regex:           '<([A-Za-z0-9\Q/-_\E])+>'