diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 67dac3931634..3fddf851bddc 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -755,7 +755,7 @@ static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
 	const bool is_srb = zfcp_fsf_req_is_status_read_buffer(req);
 	struct zfcp_adapter *adapter = req->adapter;
 	struct zfcp_qdio *qdio = adapter->qdio;
-	int req_id = req->req_id;
+	unsigned long req_id = req->req_id;
 
 	zfcp_reqlist_add(adapter->req_list, req);