diff --git a/reactos/include/wine/wineros.h b/reactos/include/wine/wineros.h
index 26f9731d6c2..bf51fd84ea0 100644
--- a/reactos/include/wine/wineros.h
+++ b/reactos/include/wine/wineros.h
@@ -35,4 +35,6 @@ typedef UINT16    *LPUINT16;
 #define FD_SETSIZE 64
 #endif
 
+#define HAVE_SSIZE_T
+
 #endif  /* __REACTOS_WINE_WINEROS_H */