diff --git a/rtmp/rtmp.go b/rtmp/rtmp.go
index 7a66a6a1..8f05d953 100644
--- a/rtmp/rtmp.go
+++ b/rtmp/rtmp.go
@@ -2194,7 +2194,7 @@ func C_RTMP_Write(r *C_RTMP, buf []byte) int {
 			buf = buf[4:]
 		}
 	}
-	return size + len(buf)
+	return size
 }
 
 /*