diff --git a/sys/arm64/arm64/elf32_machdep.c b/sys/arm64/arm64/elf32_machdep.c
--- a/sys/arm64/arm64/elf32_machdep.c
+++ b/sys/arm64/arm64/elf32_machdep.c
@@ -210,7 +210,7 @@
 		sa->code = *ap++;
 		nap--;
 	} else if (sa->code == SYS___syscall) {
-		sa->code = ap[1];
+		sa->code = ap[0];
 		nap -= 2;
 		ap += 2;
 	}