diff --git a/Alc/backends/dsound.c b/Alc/backends/dsound.c
index be0a373f..9727dd2a 100644
--- a/Alc/backends/dsound.c
+++ b/Alc/backends/dsound.c
@@ -128,7 +128,7 @@ static ALCboolean DSoundLoad(void)
 }
 
 
-static BOOL CALLBACK DSoundEnumPlaybackDevices(LPGUID guid, LPCSTR desc, LPCSTR drvname, LPVOID data)
+static BOOL CALLBACK DSoundEnumPlaybackDevices(LPGUID guid, LPCSTR desc, LPCSTR UNUSED(drvname), LPVOID UNUSED(data))
 {
     LPOLESTR guidstr = NULL;
     char str[1024];
@@ -137,9 +137,6 @@ static BOOL CALLBACK DSoundEnumPlaybackDevices(LPGUID guid, LPCSTR desc, LPCSTR
     int count;
     ALuint i;
 
-    (void)data;
-    (void)drvname;
-
     if(!guid)
         return TRUE;
 
@@ -178,7 +175,7 @@ static BOOL CALLBACK DSoundEnumPlaybackDevices(LPGUID guid, LPCSTR desc, LPCSTR
 }
 
 
-static BOOL CALLBACK DSoundEnumCaptureDevices(LPGUID guid, LPCSTR desc, LPCSTR drvname, LPVOID data)
+static BOOL CALLBACK DSoundEnumCaptureDevices(LPGUID guid, LPCSTR desc, LPCSTR UNUSED(drvname), LPVOID UNUSED(data))
 {
     LPOLESTR guidstr = NULL;
     char str[1024];
@@ -187,9 +184,6 @@ static BOOL CALLBACK DSoundEnumCaptureDevices(LPGUID guid, LPCSTR desc, LPCSTR d
     int count;
     ALuint i;
 
-    (void)data;
-    (void)drvname;
-
     if(!guid)
         return TRUE;
 
diff --git a/Alc/backends/loopback.c b/Alc/backends/loopback.c
index e1bdd3c1..067e23d1 100644
--- a/Alc/backends/loopback.c
+++ b/Alc/backends/loopback.c
@@ -32,9 +32,8 @@ static ALCenum loopback_open_playback(ALCdevice *device, const ALCchar *deviceNa
     return ALC_NO_ERROR;
 }
 
-static void loopback_close_playback(ALCdevice *device)
+static void loopback_close_playback(ALCdevice *UNUSED(device))
 {
-    (void)device;
 }
 
 static ALCboolean loopback_reset_playback(ALCdevice *device)
@@ -43,15 +42,13 @@ static ALCboolean loopback_reset_playback(ALCdevice *device)
     return ALC_TRUE;
 }
 
-static ALCboolean loopback_start_playback(ALCdevice *device)
+static ALCboolean loopback_start_playback(ALCdevice *UNUSED(device))
 {
     return ALC_TRUE;
-    (void)device;
 }
 
-static void loopback_stop_playback(ALCdevice *device)
+static void loopback_stop_playback(ALCdevice *UNUSED(device))
 {
-    (void)device;
 }
 
 
@@ -82,7 +79,6 @@ void alc_loopback_deinit(void)
 {
 }
 
-void alc_loopback_probe(enum DevProbe type)
+void alc_loopback_probe(enum DevProbe UNUSED(type))
 {
-    (void)type;
 }
diff --git a/Alc/backends/portaudio.c b/Alc/backends/portaudio.c
index 94311134..2009beb3 100644
--- a/Alc/backends/portaudio.c
+++ b/Alc/backends/portaudio.c
@@ -127,31 +127,23 @@ typedef struct {
 } pa_data;
 
 
-static int pa_callback(const void *inputBuffer, void *outputBuffer,
-                       unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo *timeInfo,
-                       const PaStreamCallbackFlags statusFlags, void *userData)
+static int pa_callback(const void *UNUSED(inputBuffer), void *outputBuffer,
+                       unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo *UNUSED(timeInfo),
+                       const PaStreamCallbackFlags UNUSED(statusFlags), void *userData)
 {
     ALCdevice *device = (ALCdevice*)userData;
 
-    (void)inputBuffer;
-    (void)timeInfo;
-    (void)statusFlags;
-
     aluMixData(device, outputBuffer, framesPerBuffer);
     return 0;
 }
 
-static int pa_capture_cb(const void *inputBuffer, void *outputBuffer,
-                         unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo *timeInfo,
-                         const PaStreamCallbackFlags statusFlags, void *userData)
+static int pa_capture_cb(const void *inputBuffer, void *UNUSED(outputBuffer),
+                         unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo *UNUSED(timeInfo),
+                         const PaStreamCallbackFlags UNUSED(statusFlags), void *userData)
 {
     ALCdevice *device = (ALCdevice*)userData;
     pa_data *data = (pa_data*)device->ExtraData;
 
-    (void)outputBuffer;
-    (void)timeInfo;
-    (void)statusFlags;
-
     WriteRingBuffer(data->ring, inputBuffer, framesPerBuffer);
     return 0;
 }
diff --git a/Alc/backends/pulseaudio.c b/Alc/backends/pulseaudio.c
index 41880a9e..f96b44fe 100644
--- a/Alc/backends/pulseaudio.c
+++ b/Alc/backends/pulseaudio.c
@@ -392,17 +392,15 @@ static void stream_state_callback2(pa_stream *stream, void *pdata)
     pa_threaded_mainloop_signal(data->loop, 0);
 }
 
-static void stream_success_callback(pa_stream *stream, int success, void *pdata)
+static void stream_success_callback(pa_stream *UNUSED(stream), int UNUSED(success), void *pdata)
 {
     ALCdevice *Device = pdata;
     pulse_data *data = Device->ExtraData;
-    (void)stream;
-    (void)success;
 
     pa_threaded_mainloop_signal(data->loop, 0);
 }
 
-static void sink_info_callback(pa_context *context, const pa_sink_info *info, int eol, void *pdata)
+static void sink_info_callback(pa_context *UNUSED(context), const pa_sink_info *info, int eol, void *pdata)
 {
     ALCdevice *device = pdata;
     pulse_data *data = device->ExtraData;
@@ -425,7 +423,6 @@ static void sink_info_callback(pa_context *context, const pa_sink_info *info, in
         { NULL, 0 }
     };
     int i;
-    (void)context;
 
     if(eol)
     {
@@ -455,14 +452,12 @@ static void sink_info_callback(pa_context *context, const pa_sink_info *info, in
     ERR("Failed to find format for channel map:\n    %s\n", chanmap_str);
 }
 
-static void sink_device_callback(pa_context *context, const pa_sink_info *info, int eol, void *pdata)
+static void sink_device_callback(pa_context *UNUSED(context), const pa_sink_info *info, int eol, void *pdata)
 {
     pa_threaded_mainloop *loop = pdata;
     void *temp;
     ALuint i;
 
-    (void)context;
-
     if(eol)
     {
         pa_threaded_mainloop_signal(loop, 0);
@@ -487,14 +482,12 @@ static void sink_device_callback(pa_context *context, const pa_sink_info *info,
     }
 }
 
-static void source_device_callback(pa_context *context, const pa_source_info *info, int eol, void *pdata)
+static void source_device_callback(pa_context *UNUSED(context), const pa_source_info *info, int eol, void *pdata)
 {
     pa_threaded_mainloop *loop = pdata;
     void *temp;
     ALuint i;
 
-    (void)context;
-
     if(eol)
     {
         pa_threaded_mainloop_signal(loop, 0);
@@ -519,11 +512,10 @@ static void source_device_callback(pa_context *context, const pa_source_info *in
     }
 }
 
-static void sink_name_callback(pa_context *context, const pa_sink_info *info, int eol, void *pdata)
+static void sink_name_callback(pa_context *UNUSED(context), const pa_sink_info *info, int eol, void *pdata)
 {
     ALCdevice *device = pdata;
     pulse_data *data = device->ExtraData;
-    (void)context;
 
     if(eol)
     {
@@ -535,11 +527,10 @@ static void sink_name_callback(pa_context *context, const pa_sink_info *info, in
     device->DeviceName = strdup(info->description);
 }
 
-static void source_name_callback(pa_context *context, const pa_source_info *info, int eol, void *pdata)
+static void source_name_callback(pa_context *UNUSED(context), const pa_source_info *info, int eol, void *pdata)
 {
     ALCdevice *device = pdata;
     pulse_data *data = device->ExtraData;
-    (void)context;
 
     if(eol)
     {
@@ -556,10 +547,9 @@ static void stream_moved_callback(pa_stream *stream, void *pdata)
 {
     ALCdevice *device = pdata;
     pulse_data *data = device->ExtraData;
-    (void)stream;
 
     free(data->device_name);
-    data->device_name = strdup(pa_stream_get_device_name(data->stream));
+    data->device_name = strdup(pa_stream_get_device_name(stream));
 
     TRACE("Stream moved to %s\n", data->device_name);
 }
@@ -1568,13 +1558,13 @@ void alc_pulse_probe(enum DevProbe type)
 
 #warning "Unsupported API version, backend will be unavailable!"
 
-ALCboolean alc_pulse_init(BackendFuncs *func_list)
-{ return ALC_FALSE; (void)func_list; }
+ALCboolean alc_pulse_init(BackendFuncs *UNUSED(func_list))
+{ return ALC_FALSE; }
 
 void alc_pulse_deinit(void)
 { }
 
-void alc_pulse_probe(enum DevProbe type)
-{ (void)type; }
+void alc_pulse_probe(enum DevProbe UNUSED(type))
+{ }
 
 #endif
diff --git a/Alc/backends/winmm.c b/Alc/backends/winmm.c
index 4786d9b4..3b2b373b 100644
--- a/Alc/backends/winmm.c
+++ b/Alc/backends/winmm.c
@@ -146,14 +146,11 @@ static void ProbeCaptureDevices(void)
     Posts a message to 'PlaybackThreadProc' everytime a WaveOut Buffer is completed and
     returns to the application (for more data)
 */
-static void CALLBACK WaveOutProc(HWAVEOUT device, UINT msg, DWORD_PTR instance, DWORD_PTR param1, DWORD_PTR param2)
+static void CALLBACK WaveOutProc(HWAVEOUT UNUSED(device), UINT msg, DWORD_PTR instance, DWORD_PTR param1, DWORD_PTR UNUSED(param2))
 {
     ALCdevice *Device = (ALCdevice*)instance;
     WinMMData *data = Device->ExtraData;
 
-    (void)device;
-    (void)param2;
-
     if(msg != WOM_DONE)
         return;
 
@@ -213,14 +210,11 @@ static DWORD WINAPI PlaybackThreadProc(LPVOID param)
     Posts a message to 'CaptureThreadProc' everytime a WaveIn Buffer is completed and
     returns to the application (with more data)
 */
-static void CALLBACK WaveInProc(HWAVEIN device, UINT msg, DWORD_PTR instance, DWORD_PTR param1, DWORD_PTR param2)
+static void CALLBACK WaveInProc(HWAVEIN UNUSED(device), UINT msg, DWORD_PTR instance, DWORD_PTR param1, DWORD_PTR UNUSED(param2))
 {
     ALCdevice *Device = (ALCdevice*)instance;
     WinMMData *data = Device->ExtraData;
 
-    (void)device;
-    (void)param2;
-
     if(msg != WIM_DATA)
         return;