diff --git a/src/genworld_gui.cpp b/src/genworld_gui.cpp
--- a/src/genworld_gui.cpp
+++ b/src/genworld_gui.cpp
@@ -473,11 +473,11 @@ struct GenerateLandscapeWindow : public 
 		EventState state;
 		this->HandleEditBoxKey(GLAND_RANDOM_EDITBOX, key, keycode, state);
 		/* the seed is unsigned, therefore atoi cannot be used.
-			* As 2^32 - 1 (MAX_UVALUE(uint32)) is a 'magic' value
+			* As 2^32 - 1 (UINT32_MAX) is a 'magic' value
 			* (use random seed) it should not be possible to be
 			* entered into the input field; the generate seed
 			* button can be used instead. */
-		_settings_newgame.game_creation.generation_seed = minu(strtoul(this->edit_str_buf, NULL, 10), MAX_UVALUE(uint32) - 1);
+		_settings_newgame.game_creation.generation_seed = minu(strtoul(this->edit_str_buf, NULL, 10), UINT32_MAX - 1);
 		return state;
 	}