diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index 3d4a750..284c86d 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -179,6 +179,14 @@ SyncRepWaitForLSN(XLogRecPtr XactCommitLSN)
 		 * lock.  We could get rid of this dance if SetLatch/ResetLatch
 		 * contained memory barriers.
 		 */
+
+		/*
+		 * syncrep.c assertion test:
+		 * 
+		 * Sleep so that walsender gets a chance to catch up before we wait
+		 */
+		pg_usleep(2 * 1000000L);
+
 		syncRepState = MyProc->syncRepState;
 		if (syncRepState == SYNC_REP_WAITING)
 		{
@@ -568,6 +576,14 @@ SyncRepWakeQueue(bool all, int mode)
 		thisproc->syncRepState = SYNC_REP_WAIT_COMPLETE;
 
 		/*
+		 * syncrep.c assertion test:
+		 *
+		 * Sleep so that the backend gets chance to examine the syncRepLinks,
+		 * triggering an assertion failure.
+		 */
+		pg_usleep(5 * 1000000L);
+
+		/*
 		 * Remove thisproc from queue.
 		 */
 		SHMQueueDelete(&(thisproc->syncRepLinks));