diff --git a/net/rds/ib_send.c b/net/rds/ib_send.c
index 4190b90ff3b1..2f57869e64d1 100644
--- a/net/rds/ib_send.c
+++ b/net/rds/ib_send.c
@@ -503,7 +503,7 @@ int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 	int flow_controlled = 0;
 	int nr_sig = 0;
 
-	BUG_ON(off % RDS_FRAG_SIZE);
+	BUG_ON(!conn->c_loopback && off % RDS_FRAG_SIZE);
 	BUG_ON(hdr_off != 0 && hdr_off != sizeof(struct rds_header));
 
 	/* Do not send cong updates to IB loopback */