diff --git a/bridge/mumble/codec.go b/bridge/mumble/codec.go
index 1cf67da6..687a28d9 100644
--- a/bridge/mumble/codec.go
+++ b/bridge/mumble/codec.go
@@ -49,7 +49,7 @@ func (e *NullAudioEncoder) ID() int {
 }
 
 func (e *NullAudioEncoder) Encode(pcm []int16, mframeSize, maxDataBytes int) ([]byte, error) {
-	return nil, fmt.Errorf("Not implemented")
+	return nil, fmt.Errorf("not implemented")
 }
 
 func (e *NullAudioEncoder) Reset() {
@@ -62,7 +62,7 @@ func (d *NullAudioDecoder) ID() int {
 }
 
 func (d *NullAudioDecoder) Decode(data []byte, frameSize int) ([]int16, error) {
-	return nil, fmt.Errorf("Not implemented")
+	return nil, fmt.Errorf("not implemented")
 }
 
 func (d *NullAudioDecoder) Reset() {