--- a/src/sound.cpp	Sat Jun 21 13:35:29 2008 +0000
+++ b/src/sound.cpp	Sat Jun 21 13:40:17 2008 +0000
@@ -167,7 +167,7 @@
 
 
 static const byte _vol_factor_by_zoom[] = {255, 190, 134, 87};
-assert_compile(lengthof(_vol_factor_by_zoom) == ZOOM_LVL_END - ZOOM_LVL_BEGIN);
+assert_compile(lengthof(_vol_factor_by_zoom) == ZOOM_LVL_COUNT);
 
 static const byte _sound_base_vol[] = {
 	128,  90, 128, 128, 128, 128, 128, 128,