diff --git a/src/backend/access/spgist/spgvacuum.c b/src/backend/access/spgist/spgvacuum.c
index 01b8ffe5ac..7c5a0016c2 100644
--- a/src/backend/access/spgist/spgvacuum.c
+++ b/src/backend/access/spgist/spgvacuum.c
@@ -451,7 +451,7 @@ vacuumLeafRoot(spgBulkDeleteState *bds, Relation index, Buffer buffer)
 	xlrec.node = index->rd_node;
 	STORE_STATE(&bds->spgstate, xlrec.stateSrc);
 
-	ACCEPT_RDATA_DATA(&xlrec, sizeof(xlrec), 0);
+	ACCEPT_RDATA_DATA(&xlrec, SizeOfSpgxlogVacuumRoot, 0);
 	/* sizeof(xlrec) should be a multiple of sizeof(OffsetNumber) */
 	ACCEPT_RDATA_DATA(toDelete, sizeof(OffsetNumber) * xlrec.nDelete, 1);
 	ACCEPT_RDATA_BUFFER(buffer, 2);
@@ -584,7 +584,7 @@ vacuumRedirectAndPlaceholder(Relation index, Buffer buffer)
 	{
 		XLogRecPtr	recptr;
 
-		ACCEPT_RDATA_DATA(&xlrec, sizeof(xlrec), 0);
+		ACCEPT_RDATA_DATA(&xlrec, SizeOfSpgxlogVacuumRedirect, 0);
 		ACCEPT_RDATA_DATA(itemToPlaceholder, sizeof(OffsetNumber) * xlrec.nToPlaceholder, 1);
 		ACCEPT_RDATA_BUFFER(buffer, 2);