diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 101879ed764ca0f3cb073f71c33396fb277db9e9..aa8228eb104b8fe7f47eea1f36de730daa003d5c 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -914,7 +914,7 @@ static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp,
 					    filp->f_path.mnt, sbi, p);
 
 	default:
-		return -ENOSYS;
+		return -EINVAL;
 	}
 }