diff --git a/codec/h265/lex.go b/codec/h265/lex.go
index cf65b3fe..06b7dcb2 100644
--- a/codec/h265/lex.go
+++ b/codec/h265/lex.go
@@ -147,24 +147,24 @@ func (l *Lexer) handleAggregation(d []byte) {
 // handleFragmentation parses NAL units from fragmentation packets and writes
 // them to the Lexer's buf.
 func (l *Lexer) handleFragmentation(d []byte) {
-	_d := d[3:]
-	if l.donl {
-		_d = d[5:]
-	}
-
 	// Get start and end indiciators from FU header.
 	start := d[2]&0x80 != 0
 	end := d[2]&0x40 != 0
 
+	d = d[3:]
+	if l.donl {
+		d = d[2:]
+	}
+
 	switch {
 	case start && !end:
 		l.frag = true
-		l.writeWithPrefix(_d)
+		l.writeWithPrefix(d)
 	case !start && end:
 		l.frag = false
 		fallthrough
 	case !start && !end:
-		l.writeNoPrefix(_d)
+		l.writeNoPrefix(d)
 	default:
 		panic("bad fragmentation packet")
 	}