diff --git a/reactos/include/crt/crtdefs.h b/reactos/include/crt/crtdefs.h
index 03bbb9be4e4..76cc426c26f 100644
--- a/reactos/include/crt/crtdefs.h
+++ b/reactos/include/crt/crtdefs.h
@@ -343,6 +343,14 @@ extern "C" {
 #endif
 #endif
 
+/* For wine code... */
+#if !defined(_MSVCRT_LONG_DEFINED) && defined(__ROS_LONG64__)
+#define _MSVCRT_LONG_DEFINED
+/* we need 32-bit longs even on 64-bit */
+typedef int __msvcrt_long;
+typedef unsigned int __msvcrt_ulong;
+#endif
+
 #ifndef _TIME_T_DEFINED
 #define _TIME_T_DEFINED
 #ifdef _USE_32BIT_TIME_T