diff --git a/platforms/audio/audio_adaptor.go b/platforms/audio/audio_adaptor.go
index 4cec6785..2146516c 100644
--- a/platforms/audio/audio_adaptor.go
+++ b/platforms/audio/audio_adaptor.go
@@ -21,9 +21,9 @@ func (a *Adaptor) Name() string { return a.name }
 
 func (a *Adaptor) SetName(n string) { a.name = n }
 
-func (a *Adaptor) Connect() []error { return nil }
+func (a *Adaptor) Connect() error { return nil }
 
-func (a *Adaptor) Finalize() []error { return nil }
+func (a *Adaptor) Finalize() error { return nil }
 
 func (a *Adaptor) Sound(fileName string) []error {
 	var errorsList []error
diff --git a/platforms/audio/audio_adaptor_test.go b/platforms/audio/audio_adaptor_test.go
index 9bac1604..00b97bec 100644
--- a/platforms/audio/audio_adaptor_test.go
+++ b/platforms/audio/audio_adaptor_test.go
@@ -14,8 +14,8 @@ var _ gobot.Adaptor = (*Adaptor)(nil)
 func TestAudioAdaptor(t *testing.T) {
 	a := NewAdaptor()
 
-	gobottest.Assert(t, len(a.Connect()), 0)
-	gobottest.Assert(t, len(a.Finalize()), 0)
+	gobottest.Assert(t, a.Connect(), nil)
+	gobottest.Assert(t, a.Finalize(), nil)
 }
 
 func TestAudioAdaptorCommandsWav(t *testing.T) {
diff --git a/platforms/audio/audio_driver.go b/platforms/audio/audio_driver.go
index 6c5f138a..259aa23a 100644
--- a/platforms/audio/audio_driver.go
+++ b/platforms/audio/audio_driver.go
@@ -53,10 +53,10 @@ func (d *Driver) adaptor() *Adaptor {
 	return d.Connection().(*Adaptor)
 }
 
-func (d *Driver) Start() (err []error) {
+func (d *Driver) Start() (err error) {
 	return
 }
 
-func (d *Driver) Halt() (err []error) {
+func (d *Driver) Halt() (err error) {
 	return
 }
diff --git a/platforms/audio/audio_driver_test.go b/platforms/audio/audio_driver_test.go
index 531b872e..d1ca964f 100644
--- a/platforms/audio/audio_driver_test.go
+++ b/platforms/audio/audio_driver_test.go
@@ -19,9 +19,9 @@ func TestAudioDriver(t *testing.T) {
 
 	gobottest.Refute(t, d.Connection(), nil)
 
-	gobottest.Assert(t, len(d.Start()), 0)
+	gobottest.Assert(t, d.Start(), nil)
 
-	gobottest.Assert(t, len(d.Halt()), 0)
+	gobottest.Assert(t, d.Halt(), nil)
 }
 
 func TestAudioDriverSoundWithNoFilename(t *testing.T) {