diff --git a/arch/sim/src/sim/up_head.c b/arch/sim/src/sim/up_head.c
index 8667f41bc72..b2aa0c86c4d 100644
--- a/arch/sim/src/sim/up_head.c
+++ b/arch/sim/src/sim/up_head.c
@@ -46,6 +46,7 @@
 #include <assert.h>
 
 #include <nuttx/init.h>
+#include <nuttx/arch.h>
 #include <nuttx/board.h>
 #include <nuttx/syslog/syslog_rpmsg.h>