diff --git a/kernel/sys.c b/kernel/sys.c
index 0929c69..f91218a 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -428,7 +428,7 @@
 {
 #ifdef CONFIG_KEXEC
 	struct kimage *image;
-	image = xchg(&kexec_image, 0);
+	image = xchg(&kexec_image, NULL);
 	if (!image) {
 		return;
 	}