diff --git a/module/bdev/ocf/volume.c b/module/bdev/ocf/volume.c
index 028db40f3..a24cfa78e 100644
--- a/module/bdev/ocf/volume.c
+++ b/module/bdev/ocf/volume.c
@@ -88,7 +88,8 @@ vbdev_ocf_volume_io_set_data(struct ocf_io *io, ctx_data_t *data,
 	io_ctx->offset = offset;
 	io_ctx->data = data;
 
-	if (io_ctx->data && offset >= io_ctx->data->size) {
+	assert(io_ctx->data != NULL);
+	if (io_ctx->data->iovs && offset >= io_ctx->data->size) {
 		return -ENOBUFS;
 	}