diff --git a/usrp/proto.go b/usrp/proto.go
index c5704d9..7a695c7 100644
--- a/usrp/proto.go
+++ b/usrp/proto.go
@@ -19,11 +19,11 @@ func (f *Frame) Init(buff []byte, n int) error {
 		return err
 	}
 	/* Can't initialize existing frame */
-	if f.Metadata == 2 {
+	if f.Metadata == METADATA {
 		return errors.New("frame is already initialized")
 	}
 	f.Metadata = int8(buff[23])
-	if f.Metadata == 2 {
+	if f.Metadata == METADATA {
 		fmt.Println("meta data")
 		callLen := buff[33]
 		f.Callsign = string(buff[46 : 46+callLen])