diff --git a/stream/mts/mpegts.go b/stream/mts/mpegts.go
index 0cfa0ca9..23fcee13 100644
--- a/stream/mts/mpegts.go
+++ b/stream/mts/mpegts.go
@@ -255,11 +255,7 @@ type Option func(p *[PacketSize]byte)
 // addAdaptationField adds an adaptation field to p, and applys the passed options to this field.
 // TODO: this will probably break if we already have adaptation field.
 func addAdaptationField(p *[PacketSize]byte, options ...Option) error {
-	b, err := packet.ContainsAdaptationField((*packet.Packet)(p))
-	if err != nil {
-		return err
-	}
-	if b {
+	if packet.ContainsAdaptationField((*packet.Packet)(p)) {
 		return errors.New("Adaptation field is already present in packet")
 	}
 	// Create space for adaptation field.
@@ -282,11 +278,7 @@ func addAdaptationField(p *[PacketSize]byte, options ...Option) error {
 // resetAdaptation sets fields in ps adaptation field to 0 if the adaptation field
 // exists, otherwise an error is returned.
 func resetAdaptation(p *[PacketSize]byte) error {
-	b, err := packet.ContainsAdaptationField((*packet.Packet)(p))
-	if err != nil {
-		return err
-	}
-	if !b {
+	if !packet.ContainsAdaptationField((*packet.Packet)(p)) {
 		return errors.New("No adaptation field in this packet")
 	}
 	p[AdaptationIdx] = DefaultAdaptationBodySize