diff --git a/pkg/aac/rtp.go b/pkg/aac/rtp.go
index dd9de0e8..1df6e036 100644
--- a/pkg/aac/rtp.go
+++ b/pkg/aac/rtp.go
@@ -79,7 +79,7 @@ func RTPPay(handler core.HandlerFunc) core.HandlerFunc {
 
 func ADTStoRTP(src []byte) (dst []byte) {
 	dst = make([]byte, 2) // header bytes
-	for i := 0; i < len(src); {
+	for i, n := 0, len(src)-ADTSHeaderSize; i < n; {
 		auSize := ReadADTSSize(src[i:])
 		dst = append(dst, byte(auSize>>5), byte(auSize<<3)) // size in bits
 		i += int(auSize)