diff --git a/mount.c b/mount.c
index e59cb0d90..021c6e3ea 100644
--- a/mount.c
+++ b/mount.c
@@ -591,7 +591,7 @@ static int validate_mounts(struct mount_info *info, bool for_dump)
 
 		if (fsroot_mounted(m)) {
 			if (m->fstype->code == FSTYPE__UNSUPPORTED) {
-				pr_err("FS mnt %s dev %#x root %s unsupported id %x\n",
+				pr_err("FS mnt %s dev %#x root %s unsupported id %d\n",
 						m->mountpoint, m->s_dev, m->root, m->mnt_id);
 				return -1;
 			}
diff --git a/proc_parse.c b/proc_parse.c
index de23e0f87..ba2efbe7d 100644
--- a/proc_parse.c
+++ b/proc_parse.c
@@ -1034,7 +1034,7 @@ struct mount_info *parse_mountinfo(pid_t pid, struct ns_id *nsid)
 			goto err;
 		}
 
-		pr_info("\ttype %s source %s mnt_id %#x s_dev %#x %s @ %s flags %#x options %s\n",
+		pr_info("\ttype %s source %s mnt_id %d s_dev %#x %s @ %s flags %#x options %s\n",
 				fst ? : new->fstype->name, new->source,
 				new->mnt_id, new->s_dev, new->root, new->mountpoint,
 				new->flags, new->options);