diff --git a/src/add-ons/media/media-add-ons/opensound/OpenSoundDevice.cpp b/src/add-ons/media/media-add-ons/opensound/OpenSoundDevice.cpp
index 41ca94e22f..dbe9d6f91b 100644
--- a/src/add-ons/media/media-add-ons/opensound/OpenSoundDevice.cpp
+++ b/src/add-ons/media/media-add-ons/opensound/OpenSoundDevice.cpp
@@ -584,7 +584,7 @@ OpenSoundDevice::MixerAt(int32 i)
 }
 
 OpenSoundDeviceEngine *
-OpenSoundDevice::NextFreeEngineAt(int32 i, bool rec=false)
+OpenSoundDevice::NextFreeEngineAt(int32 i, bool rec)
 {
 	// find the first free engine in the rec or play chain
 	OpenSoundDeviceEngine *engine = EngineAt(i);
diff --git a/src/add-ons/media/media-add-ons/opensound/OpenSoundDeviceEngine.cpp b/src/add-ons/media/media-add-ons/opensound/OpenSoundDeviceEngine.cpp
index 06307c99b2..16eb56d577 100644
--- a/src/add-ons/media/media-add-ons/opensound/OpenSoundDeviceEngine.cpp
+++ b/src/add-ons/media/media-add-ons/opensound/OpenSoundDeviceEngine.cpp
@@ -269,7 +269,7 @@ status_t OpenSoundDeviceEngine::SetSpeed(int speed)
 }
 
 
-size_t OpenSoundDeviceEngine::GetISpace(audio_buf_info *info=NULL)
+size_t OpenSoundDeviceEngine::GetISpace(audio_buf_info *info)
 {
 	audio_buf_info abinfo;
 	CALLED();
@@ -288,7 +288,7 @@ size_t OpenSoundDeviceEngine::GetISpace(audio_buf_info *info=NULL)
 }
 
 
-size_t OpenSoundDeviceEngine::GetOSpace(audio_buf_info *info=NULL)
+size_t OpenSoundDeviceEngine::GetOSpace(audio_buf_info *info)
 {
 	audio_buf_info abinfo;
 	//CALLED();