diff --git a/src/hnsw.c b/src/hnsw.c
index 2b6d8b1..bd05719 100644
--- a/src/hnsw.c
+++ b/src/hnsw.c
@@ -207,7 +207,7 @@ hnswcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
 	get_tablespace_page_costs(path->indexinfo->reltablespace, NULL, &spc_seq_page_cost);
 
 	/* Adjust cost if needed since TOAST not included in seq scan cost */
-	if (costs.numIndexPages > path->indexinfo->rel->pages)
+	if (costs.numIndexPages > path->indexinfo->rel->pages && costs.numIndexTuples / (path->indexinfo->tuples + 1) < 0.5)
 	{
 		/* Change all page cost from random to sequential */
 		costs.indexTotalCost -= costs.numIndexPages * (costs.spc_random_page_cost - spc_seq_page_cost);