diff --git a/usr.bin/kdump/kdump.c b/usr.bin/kdump/kdump.c
--- a/usr.bin/kdump/kdump.c
+++ b/usr.bin/kdump/kdump.c
@@ -922,7 +922,8 @@
 				print_number(ip, narg, c);
 				print_number(ip, narg, c);
 				putchar(',');
-				print_mask_arg(sysdecode_close_range_flags, *ip);
+				print_mask_arg0(sysdecode_close_range_flags,
+				    *ip);
 				ip += 3;
 				narg -= 3;
 				break;
@@ -988,14 +989,14 @@
 				print_number(ip, narg, c);
 				print_number(ip, narg, c);
 				putchar(',');
-				print_mask_arg(sysdecode_mount_flags, *ip);
+				print_mask_arg0(sysdecode_mount_flags, *ip);
 				ip++;
 				narg--;
 				break;
 			case SYS_unmount:
 				print_number(ip, narg, c);
 				putchar(',');
-				print_mask_arg(sysdecode_mount_flags, *ip);
+				print_mask_arg0(sysdecode_mount_flags, *ip);
 				ip++;
 				narg--;
 				break;
@@ -1453,7 +1454,7 @@
 				print_number(ip, narg, c);
 				print_number(ip, narg, c);
 				putchar(',');
-				print_mask_arg(sysdecode_mount_flags, *ip);
+				print_mask_arg0(sysdecode_mount_flags, *ip);
 				ip++;
 				narg--;
 				break;