diff --git a/src/hnswvacuum.c b/src/hnswvacuum.c
index 5e01cd8..7099571 100644
--- a/src/hnswvacuum.c
+++ b/src/hnswvacuum.c
@@ -409,6 +409,10 @@ MarkDeleted(HnswVacuumState * vacuumstate)
 			if (!HnswIsElementTuple(etup))
 				continue;
 
+			/* Skip deleted tuples */
+			if (etup->deleted)
+				continue;
+
 			if (ItemPointerIsValid(&etup->heaptids[0]))
 			{
 				stats->num_index_tuples++;