diff --git a/drivers/ub/urma/uburma/uburma_dev_ops.c b/drivers/ub/urma/uburma/uburma_dev_ops.c
index 51fb42ecddbc865fe045df4b33efeb87874520d0..8e0f637b67de23c6909f40a4aeab195fb17969c1 100644
--- a/drivers/ub/urma/uburma/uburma_dev_ops.c
+++ b/drivers/ub/urma/uburma/uburma_dev_ops.c
@@ -180,7 +180,7 @@ int uburma_open(struct inode *inode, struct file *filp)
 	srcu_idx = srcu_read_lock(&ubu_dev->ubc_dev_srcu);
 	ubc_dev = srcu_dereference(ubu_dev->ubc_dev, &ubu_dev->ubc_dev_srcu);
 	if (!ubc_dev) {
-		ret = EIO;
+		ret = -EIO;
 		uburma_log_err("can not find ubcore device.\n");
 		goto err;
 	}