diff --git a/src/modules/audio/openal/Filter.cpp b/src/modules/audio/openal/Filter.cpp
index 148ad1051..1a28d8a2b 100644
--- a/src/modules/audio/openal/Filter.cpp
+++ b/src/modules/audio/openal/Filter.cpp
@@ -84,18 +84,19 @@ bool Filter::setParams(Type type, const std::vector<float> &params)
 	#ifdef ALC_EXT_EFX
 	switch (type)
 	{
-		case TYPE_LOWPASS:
-			alFilteri(filter, AL_FILTER_TYPE, AL_FILTER_LOWPASS);
-			break;
-		case TYPE_HIGHPASS:
-			alFilteri(filter, AL_FILTER_TYPE, AL_FILTER_HIGHPASS);
-			break;
-		case TYPE_BANDPASS:
-			alFilteri(filter, AL_FILTER_TYPE, AL_FILTER_BANDPASS);
-			break;
-		case TYPE_MAX_ENUM:
-			break;
+	case TYPE_LOWPASS:
+		alFilteri(filter, AL_FILTER_TYPE, AL_FILTER_LOWPASS);
+		break;
+	case TYPE_HIGHPASS:
+		alFilteri(filter, AL_FILTER_TYPE, AL_FILTER_HIGHPASS);
+		break;
+	case TYPE_BANDPASS:
+		alFilteri(filter, AL_FILTER_TYPE, AL_FILTER_BANDPASS);
+		break;
+	case TYPE_MAX_ENUM:
+		break;
 	}
+
 	//failed to make filter specific type - not supported etc.
 	if (alGetError() != AL_NO_ERROR)
 	{
@@ -105,21 +106,21 @@ bool Filter::setParams(Type type, const std::vector<float> &params)
 
 	switch (type)
 	{
-		case TYPE_LOWPASS:
-			alFilterf(filter, AL_LOWPASS_GAIN, clampf(params[0], AL_LOWPASS_MIN_GAIN, AL_LOWPASS_MAX_GAIN));
-			alFilterf(filter, AL_LOWPASS_GAINHF, clampf(params[1], AL_LOWPASS_MIN_GAINHF, AL_LOWPASS_MAX_GAINHF));
-			break;
-		case TYPE_HIGHPASS:
-			alFilterf(filter, AL_HIGHPASS_GAIN, clampf(params[0], AL_HIGHPASS_MIN_GAIN, AL_HIGHPASS_MAX_GAIN));
-			alFilterf(filter, AL_HIGHPASS_GAINLF, clampf(params[1], AL_HIGHPASS_MIN_GAINLF, AL_HIGHPASS_MAX_GAINLF));
-			break;
-		case TYPE_BANDPASS:
-			alFilterf(filter, AL_BANDPASS_GAIN, clampf(params[0], AL_BANDPASS_MIN_GAIN, AL_BANDPASS_MAX_GAIN));
-			alFilterf(filter, AL_BANDPASS_GAINLF, clampf(params[1], AL_BANDPASS_MIN_GAINLF, AL_BANDPASS_MAX_GAINLF));
-			alFilterf(filter, AL_BANDPASS_GAINHF, clampf(params[2], AL_BANDPASS_MIN_GAINHF, AL_BANDPASS_MAX_GAINHF));
-			break;
-		case TYPE_MAX_ENUM:
-			break;
+	case TYPE_LOWPASS:
+		alFilterf(filter, AL_LOWPASS_GAIN, clampf(params[0], AL_LOWPASS_MIN_GAIN, AL_LOWPASS_MAX_GAIN));
+		alFilterf(filter, AL_LOWPASS_GAINHF, clampf(params[1], AL_LOWPASS_MIN_GAINHF, AL_LOWPASS_MAX_GAINHF));
+		break;
+	case TYPE_HIGHPASS:
+		alFilterf(filter, AL_HIGHPASS_GAIN, clampf(params[0], AL_HIGHPASS_MIN_GAIN, AL_HIGHPASS_MAX_GAIN));
+		alFilterf(filter, AL_HIGHPASS_GAINLF, clampf(params[1], AL_HIGHPASS_MIN_GAINLF, AL_HIGHPASS_MAX_GAINLF));
+		break;
+	case TYPE_BANDPASS:
+		alFilterf(filter, AL_BANDPASS_GAIN, clampf(params[0], AL_BANDPASS_MIN_GAIN, AL_BANDPASS_MAX_GAIN));
+		alFilterf(filter, AL_BANDPASS_GAINLF, clampf(params[1], AL_BANDPASS_MIN_GAINLF, AL_BANDPASS_MAX_GAINLF));
+		alFilterf(filter, AL_BANDPASS_GAINHF, clampf(params[2], AL_BANDPASS_MIN_GAINHF, AL_BANDPASS_MAX_GAINHF));
+		break;
+	case TYPE_MAX_ENUM:
+		break;
 	}
 	#endif
 
diff --git a/src/modules/audio/openal/Filter.h b/src/modules/audio/openal/Filter.h
index 9ca984d66..3d41e835b 100644
--- a/src/modules/audio/openal/Filter.h
+++ b/src/modules/audio/openal/Filter.h
@@ -29,6 +29,7 @@
 #else
 #include <OpenAL-Soft/alc.h>
 #include <OpenAL-Soft/al.h>
+#include <OpenAL-Soft/alext.h>
 #endif
 #else
 #include <AL/alc.h>
diff --git a/src/modules/audio/wrap_Source.cpp b/src/modules/audio/wrap_Source.cpp
index 556bd3133..ba57211e5 100644
--- a/src/modules/audio/wrap_Source.cpp
+++ b/src/modules/audio/wrap_Source.cpp
@@ -347,7 +347,7 @@ int w_Source_setFilter(lua_State *L)
 	else if (lua_gettop(L) > 2)
 	{
 		const char *ftypestr = luaL_checkstring(L, 2);
-		if (ftypestr && !Filter::getConstant(ftypestr, type))
+		if (!Filter::getConstant(ftypestr, type))
 			return luaL_error(L, "Invalid filter type: %s", ftypestr);
 
 		unsigned int count = Filter::getParameterCount(type);
@@ -363,7 +363,7 @@ int w_Source_setFilter(lua_State *L)
 		}
 		lua_rawgeti(L, 2, 1);
 		const char *ftypestr = luaL_checkstring(L, -1);
-		if (ftypestr && !Filter::getConstant(ftypestr, type))
+		if (!Filter::getConstant(ftypestr, type))
 			return luaL_error(L, "Invalid filter type: %s", ftypestr);
 		lua_pop(L, 1);