diff --git a/common/cmd_mp.c b/common/cmd_mp.c
index 26a57c5..b2a397c 100644
--- a/common/cmd_mp.c
+++ b/common/cmd_mp.c
@@ -35,7 +35,7 @@
 
 	cpuid = simple_strtoul(argv[1], NULL, 10);
 	if (cpuid >= CONFIG_NR_CPUS) {
-		printf ("Core num: %d is out of range[0..%d]\n",
+		printf ("Core num: %lu is out of range[0..%d]\n",
 				cpuid, CONFIG_NR_CPUS - 1);
 		return 1;
 	}