diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
index 231e92d..db22a26 100644
--- a/src/backend/commands/vacuumlazy.c
+++ b/src/backend/commands/vacuumlazy.c
@@ -1952,7 +1952,7 @@ lazy_space_alloc(LVRelStats *vacrelstats, BlockNumber relblocks)
 	{
 		maxtuples = (vac_work_mem * 1024L) / sizeof(ItemPointerData);
 		maxtuples = Min(maxtuples, INT_MAX);
-		maxtuples = Min(maxtuples, MaxAllocSize / sizeof(ItemPointerData));
+		maxtuples = Min(maxtuples, MaxAllocHugeSize / sizeof(ItemPointerData));
 
 		/* curious coding here to ensure the multiplication can't overflow */
 		if ((BlockNumber) (maxtuples / LAZY_ALLOC_TUPLES) > relblocks)
@@ -1969,7 +1969,8 @@ lazy_space_alloc(LVRelStats *vacrelstats, BlockNumber relblocks)
 	vacrelstats->num_dead_tuples = 0;
 	vacrelstats->max_dead_tuples = (int) maxtuples;
 	vacrelstats->dead_tuples = (ItemPointer)
-		palloc(maxtuples * sizeof(ItemPointerData));
+		MemoryContextAllocHuge(CurrentMemoryContext,
+							maxtuples * sizeof(ItemPointerData));
 }
 
 /*