diff --git a/dnn.go b/dnn.go
index 979d68b3..0dc46e2e 100644
--- a/dnn.go
+++ b/dnn.go
@@ -522,7 +522,7 @@ func (l *Layer) OutputNameToIndex(name string) int {
 //
 // For futher details, please see:
 // https://docs.opencv.org/4.4.0/d6/d0f/group__dnn.html#ga9d118d70a1659af729d01b10233213ee
-func NMSBoxes(bboxes []image.Rectangle, scores []float32, scoreThreshold float32, nmsThreshold float32, indices []int) {
+func NMSBoxes(bboxes []image.Rectangle, scores []float32, scoreThreshold float32, nmsThreshold float32) (indices []int) {
 	bboxesRectArr := []C.struct_Rect{}
 	for _, v := range bboxes {
 		bbox := C.struct_Rect{
@@ -560,6 +560,8 @@ func NMSBoxes(bboxes []image.Rectangle, scores []float32, scoreThreshold float32
 
 	ptr := *(*[]C.int)(unsafe.Pointer(h))
 
+
+	indices = make([]int,indicesVector.length)
 	for i := 0; i < int(indicesVector.length); i++ {
 		indices[i] = int(ptr[i])
 	}
@@ -570,7 +572,7 @@ func NMSBoxes(bboxes []image.Rectangle, scores []float32, scoreThreshold float32
 //
 // For futher details, please see:
 // https://docs.opencv.org/4.4.0/d6/d0f/group__dnn.html#ga9d118d70a1659af729d01b10233213ee
-func NMSBoxesWithParams(bboxes []image.Rectangle, scores []float32, scoreThreshold float32, nmsThreshold float32, indices []int, eta float32, topK int) {
+func NMSBoxesWithParams(bboxes []image.Rectangle, scores []float32, scoreThreshold float32, nmsThreshold float32, eta float32, topK int) (indices []int) {
 	bboxesRectArr := []C.struct_Rect{}
 	for _, v := range bboxes {
 		bbox := C.struct_Rect{
@@ -608,6 +610,7 @@ func NMSBoxesWithParams(bboxes []image.Rectangle, scores []float32, scoreThresho
 
 	ptr := *(*[]C.int)(unsafe.Pointer(h))
 
+	indices = make([]int,indicesVector.length)
 	for i := 0; i < int(indicesVector.length); i++ {
 		indices[i] = int(ptr[i])
 	}
diff --git a/dnn_test.go b/dnn_test.go
index e4474bf7..7fcb92df 100644
--- a/dnn_test.go
+++ b/dnn_test.go
@@ -591,11 +591,10 @@ func TestNMSBoxes(t *testing.T) {
 		image.Rect(156, 51, 640, 480),
 	}
 	scores := []float32{0.82094115, 0.7998236, 0.9809663, 0.99717456, 0.89628726}
-	indices := make([]int, 10)
 	scoreThreshold := float32(0.5)
 	nmsThreshold := float32(0.4)
 
-	NMSBoxes(bboxes, scores, scoreThreshold, nmsThreshold, indices)
+	indices := NMSBoxes(bboxes, scores, scoreThreshold, nmsThreshold)
 
 	if indices[0] != 3 {
 		t.Errorf("Invalid NMSBoxes test indices: %v", indices)
@@ -619,11 +618,10 @@ func TestNMSBoxesWithParams(t *testing.T) {
 		image.Rect(156, 51, 640, 480),
 	}
 	scores := []float32{0.82094115, 0.7998236, 0.9809663, 0.99717456, 0.89628726}
-	indices := make([]int, 10)
 	scoreThreshold := float32(0.5)
 	nmsThreshold := float32(0.4)
 
-	NMSBoxesWithParams(bboxes, scores, scoreThreshold, nmsThreshold, indices, float32(1.0), 0)
+	indices := NMSBoxesWithParams(bboxes, scores, scoreThreshold, nmsThreshold, float32(1.0), 0)
 
 	if indices[0] != 3 {
 		t.Errorf("Invalid NMSBoxesWithParams test indices: %v", indices)