diff --git a/kernel/mod2.h b/kernel/mod2.h
index 867fcae47..2abd84f23 100644
--- a/kernel/mod2.h
+++ b/kernel/mod2.h
@@ -60,8 +60,10 @@
 
 /* define for parallel processes with shared memory */
 #ifndef __CCYGWIN__
+#ifndef SI_CPU_AARCH64
 #define HAVE_VSPACE 1
 #endif
+#endif
 
 /*#define PROFILING*/
 #ifdef PROFILING