diff --git a/src/ivfkmeans.c b/src/ivfkmeans.c
index 8d2c793..f61ba1d 100644
--- a/src/ivfkmeans.c
+++ b/src/ivfkmeans.c
@@ -143,6 +143,22 @@ CompareBitVectors(const void *a, const void *b)
 	return DirectFunctionCall2(bitcmp, VarBitPGetDatum((VarBit *) a), VarBitPGetDatum((VarBit *) b));
 }
 
+/*
+ * Sort vector array
+ */
+static void
+SortVectorArray(VectorArray arr, IvfflatType type)
+{
+	if (type == IVFFLAT_TYPE_VECTOR)
+		qsort(arr->items, arr->length, arr->itemsize, CompareVectors);
+	else if (type == IVFFLAT_TYPE_HALFVEC)
+		qsort(arr->items, arr->length, arr->itemsize, CompareHalfVectors);
+	else if (type == IVFFLAT_TYPE_BIT)
+		qsort(arr->items, arr->length, arr->itemsize, CompareBitVectors);
+	else
+		elog(ERROR, "Unsupported type");
+}
+
 /*
  * Quick approach if we have little data
  */
@@ -157,14 +173,7 @@ QuickCenters(Relation index, VectorArray samples, VectorArray centers, IvfflatTy
 	/* Copy existing vectors while avoiding duplicates */
 	if (samples->length > 0)
 	{
-		if (type == IVFFLAT_TYPE_VECTOR)
-			qsort(samples->items, samples->length, samples->itemsize, CompareVectors);
-		else if (type == IVFFLAT_TYPE_HALFVEC)
-			qsort(samples->items, samples->length, samples->itemsize, CompareHalfVectors);
-		else if (type == IVFFLAT_TYPE_BIT)
-			qsort(samples->items, samples->length, samples->itemsize, CompareBitVectors);
-		else
-			elog(ERROR, "Unsupported type");
+		SortVectorArray(samples, type);
 
 		for (int i = 0; i < samples->length; i++)
 		{
@@ -708,13 +717,7 @@ CheckCenters(Relation index, VectorArray centers, IvfflatType type)
 	if (type != IVFFLAT_TYPE_BIT)
 	{
 		/* Ensure no duplicate centers */
-		/* Fine to sort in-place */
-		if (type == IVFFLAT_TYPE_VECTOR)
-			qsort(centers->items, centers->length, centers->itemsize, CompareVectors);
-		else if (type == IVFFLAT_TYPE_HALFVEC)
-			qsort(centers->items, centers->length, centers->itemsize, CompareHalfVectors);
-		else
-			elog(ERROR, "Unsupported type");
+		SortVectorArray(centers, type);
 
 		for (int i = 1; i < centers->length; i++)
 		{