diff --git a/libcxx/include/__format/format_error.h b/libcxx/include/__format/format_error.h
index 608a16d361d88..0f4582f7012ed 100644
--- a/libcxx/include/__format/format_error.h
+++ b/libcxx/include/__format/format_error.h
@@ -7,8 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef _LIBCPP__FORMAT_FORMAT_ERROR_H
-#define _LIBCPP__FORMAT_FORMAT_ERROR_H
+#ifndef _LIBCPP___FORMAT_FORMAT_ERROR_H
+#define _LIBCPP___FORMAT_FORMAT_ERROR_H
 
 #include <__config>
 #include <stdexcept>
@@ -53,4 +53,4 @@ _LIBCPP_END_NAMESPACE_STD
 
 _LIBCPP_POP_MACROS
 
-#endif // _LIBCPP__FORMAT_FORMAT_ERROR_H
+#endif // _LIBCPP___FORMAT_FORMAT_ERROR_H