diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c
index d616ba361f5cfd84f3d7da3059522f3dd1d6c2db..1438685536f57f2bcb5db166d997ac9da6aa2f81 100644
--- a/src/backend/executor/execMain.c
+++ b/src/backend/executor/execMain.c
@@ -2917,7 +2917,7 @@ EvalPlanQualStart(EPQState *epqstate, Plan *planTree)
 	{
 		Assert(epqstate->relsubs_done != NULL);
 		memset(epqstate->relsubs_rowmark, 0,
-			   sizeof(rtsize * sizeof(ExecAuxRowMark *)));
+			   rtsize * sizeof(ExecAuxRowMark *));
 		memset(epqstate->relsubs_done, 0,
 			   rtsize * sizeof(bool));
 	}
@@ -2971,7 +2971,7 @@ EvalPlanQualEnd(EPQState *epqstate)
 	if (epqstate->tuple_table != NIL)
 	{
 		memset(epqstate->relsubs_slot, 0,
-			   sizeof(rtsize * sizeof(TupleTableSlot *)));
+			   rtsize * sizeof(TupleTableSlot *));
 		ExecResetTupleTable(epqstate->tuple_table, true);
 		epqstate->tuple_table = NIL;
 	}