diff --git a/cpuid.c b/cpuid.c
index 3cc7cb9..334f3f8 100644
--- a/cpuid.c
+++ b/cpuid.c
@@ -184,7 +184,7 @@ int main(int argc, char *argv[])
 		exit(127);
 	} else if (argc == 2) {
 		cpu = strtoul(argv[1], &endptr, 0);
-		if (*endptr || cpu > 255) {
+		if (*endptr || cpu > 5119) {
 			usage();
 			exit(127);
 		}
diff --git a/rdmsr.c b/rdmsr.c
index d1acca5..b19986a 100644
--- a/rdmsr.c
+++ b/rdmsr.c
@@ -169,7 +169,7 @@ int main(int argc, char *argv[])
 			break;
 		case 'p':
 			arg = strtoul(optarg, &endarg, 0);
-			if (*endarg || arg > 255) {
+			if (*endarg || arg > 5119) {
 				usage();
 				exit(127);
 			}
diff --git a/wrmsr.c b/wrmsr.c
index af16a8d..b32cc3e 100644
--- a/wrmsr.c
+++ b/wrmsr.c
@@ -103,7 +103,7 @@ int main(int argc, char *argv[])
 			break;
 		case 'p':
 			arg = strtoul(optarg, &endarg, 0);
-			if (*endarg || arg > 255) {
+			if (*endarg || arg > 5119) {
 				usage();
 				exit(127);
 			}