diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index b1957d6c8bf5..cf3c10e23c50 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -628,7 +628,8 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
 		/* assert something? */
 		if (req->rq_state & RQ_NET_PENDING) {
 			dec_ap_pending(mdev);
-			atomic_sub(req->i.size >> 9, &mdev->ap_in_flight);
+			if (req->rq_state & RQ_WRITE)
+				atomic_sub(req->i.size >> 9, &mdev->ap_in_flight);
 		}
 		req->rq_state &= ~(RQ_NET_OK|RQ_NET_PENDING);