diff --git a/filter/mog.go b/filter/mog.go
index cff19d3e..bd916791 100644
--- a/filter/mog.go
+++ b/filter/mog.go
@@ -83,7 +83,7 @@ func (m *MOGFilter) Write(f []byte) (int, error) {
 	if hfCount < (m.hf - 1) {
 		m.hold[hfCount] = f
 		hfCount++
-		return -1, nil
+		return 0, nil
 	} else {
 		img, err := gocv.IMDecode(f, gocv.IMReadColor)
 		if err != nil {