diff --git a/src/backend/executor/nodeGather.c b/src/backend/executor/nodeGather.c
index 89266b5..384817c 100644
--- a/src/backend/executor/nodeGather.c
+++ b/src/backend/executor/nodeGather.c
@@ -173,6 +173,7 @@ ExecGather(PlanState *pstate)
 			 */
 			pcxt = node->pei->pcxt;
 			LaunchParallelWorkers(pcxt);
+			WaitForParallelWorkersToAttach(pcxt);
 			/* We save # workers launched for the benefit of EXPLAIN */
 			node->nworkers_launched = pcxt->nworkers_launched;