diff --git a/codec/mjpeg/jpeg.go b/codec/mjpeg/jpeg.go
index d669e57d..10e53e58 100644
--- a/codec/mjpeg/jpeg.go
+++ b/codec/mjpeg/jpeg.go
@@ -251,9 +251,7 @@ func (c *Context) ParsePayload(p []byte, m bool) error {
 			qLen = len(qTable)
 		}
 
-		c.blen = 0
-
-		c.blen += writeHeader(c.buf[c.blen:], int(t), int(width), int(height), qLen/64, dri, qTable)
+		c.blen = writeHeader(c.buf[c.blen:], int(t), int(width), int(height), qLen/64, dri, qTable)
 	}
 
 	if c.blen == 0 {