diff --git a/include/bx/crtimpl.h b/include/bx/crtimpl.h
index dff0120..e26f195 100644
--- a/include/bx/crtimpl.h
+++ b/include/bx/crtimpl.h
@@ -6,6 +6,8 @@
 #ifndef BX_CRTIMPL_H_HEADER_GUARD
 #define BX_CRTIMPL_H_HEADER_GUARD
 
+#include "bx.h"
+
 #if BX_CONFIG_ALLOCATOR_CRT
 #	include <malloc.h>
 #	include "allocator.h"