diff --git a/sbin/tunefs/tunefs.c b/sbin/tunefs/tunefs.c
index 924faa9b5045..734e01d75204 100644
--- a/sbin/tunefs/tunefs.c
+++ b/sbin/tunefs/tunefs.c
@@ -165,6 +165,7 @@ main(argc, argv)
 		oflag = 1;
 		break;
 	  case 'p':
+		found_arg = 1;
 		pflag = 1;
 		break;
 	  default: