diff --git a/sc2/build/build.config b/sc2/build/build.config
index d5c650cab..6a28b7193 100644
--- a/sc2/build/build.config
+++ b/sc2/build/build.config
@@ -75,17 +75,22 @@ CHOICE_sound_OPTIONS="SDL_mixer openal"
 CHOICE_sound_TITLE="Sound backend"
 CHOICE_sound_OPTION_SDL_mixer_TITLE="Use SDL_mixer for sound"
 CHOICE_sound_OPTION_SDL_mixer_PRECOND="have_library SDL_mixer"
-CHOICE_sound_OPTION_SDL_mixer_ACTION='
-		eval SOUNDMODULE=sdl;
-		use_library SDL_mixer'
+CHOICE_sound_OPTION_SDL_mixer_ACTION=sound_sdl_action
+sound_sdl_action() {
+	CFLAGS="$CFLAGS -DSOUNDMODULE_SDL"
+	eval SOUNDMODULE=sdl
+	use_library SDL_mixer
+}
 CHOICE_sound_OPTION_openal_TITLE="Use OpenAL for sound (experimental)"
 CHOICE_sound_OPTION_openal_PRECOND="have_library openal"
-CHOICE_sound_OPTION_openal_ACTION='
-		eval CFLAGS="$CFLAGS -DSOUNDMODULE_OPENAL";
-		eval SOUNDMODULE=openal;
-		use_library openal;
-		use_library vorbisfile'
-#		use_library vorbis;
+CHOICE_sound_OPTION_openal_ACTION=sound_openal_action
+sound_openal_action() {
+	CFLAGS="$CFLAGS -DSOUNDMODULE_OPENAL"
+	SOUNDMODULE=openal
+	use_library openal
+	use_library vorbisfile
+#	use_library vorbis
+}
 CHOICE_sound_DEFAULT=SDL_mixer
 
 CHOICE_link_OPTIONS="static dynamic"