diff --git a/codec/mjpeg/jpeg.go b/codec/mjpeg/jpeg.go
index cfe0c17a..4d127bfc 100644
--- a/codec/mjpeg/jpeg.go
+++ b/codec/mjpeg/jpeg.go
@@ -280,9 +280,7 @@ func (c *Context) ParsePayload(p []byte, m bool) error {
 
 	// Write frame data
 	rem := len(p)
-	f := p[idx:rem]
-	copy(c.buf[c.blen:], f)
-	c.blen += len(f)
+	c.blen += copy(c.buf[c.blen:], p[idx:rem])
 	idx += rem
 
 	if m {