diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
index 45b1859..bf73a1b 100644
--- a/src/backend/commands/vacuumlazy.c
+++ b/src/backend/commands/vacuumlazy.c
@@ -280,7 +280,8 @@ lazy_vacuum_rel(Relation onerel, int options, VacuumParams *params,
 	 * Optionally truncate the relation.
 	 */
 	if (should_attempt_truncation(vacrelstats))
-		lazy_truncate_heap(onerel, vacrelstats);
+		if (OldestXmin >= ShmemVariableCache->latestCompletedXid)
+			lazy_truncate_heap(onerel, vacrelstats);

 	/* Report that we are now doing final cleanup */
 	pgstat_progress_update_param(PROGRESS_VACUUM_PHASE,