diff --git a/sdk/tools/mkisofs/reactos/xconfig.h b/sdk/tools/mkisofs/reactos/xconfig.h
index 8cb5b739500..19b340402f2 100644
--- a/sdk/tools/mkisofs/reactos/xconfig.h
+++ b/sdk/tools/mkisofs/reactos/xconfig.h
@@ -180,8 +180,10 @@
 #define HAVE_LONGLONG 1
 
 #ifndef _WIN32
+#if !defined(__arm__) && !defined(__aarch64__)
     #define VA_LIST_IS_ARRAY 1
 #endif
+#endif
 
 #ifdef _WIN32
     #define uid_t int