diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 47351a1f7..6b5f66a3e 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -865,12 +865,6 @@ set( NOT_COMPILED_SOURCE_FILES
 )
 
 set( FASTMATH_SOURCES
-	nodebuild.cpp
-	nodebuild_classify_nosse2.cpp
-	nodebuild_events.cpp
-	nodebuild_extract.cpp
-	nodebuild_gl.cpp
-	nodebuild_utility.cpp
 	r_swrenderer.cpp
 	r_3dfloors.cpp
 	r_bsp.cpp
@@ -1026,6 +1020,12 @@ add_executable( zdoom WIN32 MACOSX_BUNDLE
 	memarena.cpp
 	md5.cpp
 	name.cpp
+	nodebuild.cpp
+	nodebuild_classify_nosse2.cpp
+	nodebuild_events.cpp
+	nodebuild_extract.cpp
+	nodebuild_gl.cpp
+	nodebuild_utility.cpp
 	pathexpander.cpp
 	p_3dfloors.cpp
 	p_3dmidtex.cpp
diff --git a/src/sound/oalsound.cpp b/src/sound/oalsound.cpp
index 768e7b7ba..f35cc8c3e 100644
--- a/src/sound/oalsound.cpp
+++ b/src/sound/oalsound.cpp
@@ -781,7 +781,20 @@ OpenALSoundRenderer::OpenALSoundRenderer()
     alcGetIntegerv(Device, ALC_MONO_SOURCES, 1, &numMono);
     alcGetIntegerv(Device, ALC_STEREO_SOURCES, 1, &numStereo);
 
-    Sources.Resize(MIN<int>(MAX<int>(*snd_channels, 2), numMono+numStereo));
+    // OpenAL specification doesn't require alcGetIntegerv() to return
+    // meaningful values for ALC_MONO_SOURCES and ALC_MONO_SOURCES.
+    // At least Apple's OpenAL implementation returns zeroes,
+    // although it can generate reasonable number of sources.
+
+    const int numChannels = MAX<int>(*snd_channels, 2);
+    int numSources = numMono + numStereo;
+
+    if (0 == numSources)
+    {
+        numSources = numChannels;
+    }
+
+    Sources.Resize(MIN<int>(numChannels, numSources));
     for(unsigned i = 0;i < Sources.Size();i++)
     {
         alGenSources(1, &Sources[i]);