diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9522e3a..479e023 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.1.5 (unreleased)
+
+- Reduced memory usage during index build
+
 ## 0.1.4 (2021-05-09)
 
 - Fixed kmeans for inner product
diff --git a/src/ivfbuild.c b/src/ivfbuild.c
index b64b5f4..2755b28 100644
--- a/src/ivfbuild.c
+++ b/src/ivfbuild.c
@@ -194,7 +194,10 @@ GetNextTuple(Tuplesortstate *sortstate, TupleDesc tupdesc, TupleTableSlot *slot,
 		ItemPointerSet(&(*itup)->t_tid, tupblk, tupoff);
 	}
 	else
+	{
 		*list = -1;
+		*itup = NULL;
+	}
 }
 
 /*
@@ -243,6 +246,8 @@ InsertTuples(Relation index, IvfflatBuildState * buildstate, ForkNumber forkNum)
 
 			buildstate->indtuples += 1;
 
+			pfree(itup);
+
 			GetNextTuple(buildstate->sortstate, tupdesc, slot, &itup, &list);
 		}
 
@@ -253,6 +258,9 @@ InsertTuples(Relation index, IvfflatBuildState * buildstate, ForkNumber forkNum)
 		/* Set the start and insert pages */
 		IvfflatUpdateList(index, state, buildstate->listInfo[i], insertPage, startPage, forkNum);
 	}
+
+	if (itup != NULL)
+		pfree(itup);
 }
 
 /*