diff --git a/lib/libc/amd64/sys/reboot.S b/lib/libc/amd64/sys/reboot.S
index 80e3d36d4632..450a65e2f0bd 100644
--- a/lib/libc/amd64/sys/reboot.S
+++ b/lib/libc/amd64/sys/reboot.S
@@ -43,4 +43,4 @@ __FBSDID("$FreeBSD$");
 #include "SYS.h"
 
 SYSCALL(reboot)
-	iret
+	iretq