diff --git a/src/settings.cpp b/src/settings.cpp
--- a/src/settings.cpp
+++ b/src/settings.cpp
@@ -1147,7 +1147,7 @@ static bool InvalidateCompanyWindow(int3
 static void ValidateSettings()
 {
 	/* Do not allow a custom sea level with the original land generator. */
-	if (_settings_newgame.game_creation.land_generator == 0 &&
+	if (_settings_newgame.game_creation.land_generator == LG_ORIGINAL &&
 			_settings_newgame.difficulty.quantity_sea_lakes == CUSTOM_SEA_LEVEL_NUMBER_DIFFICULTY) {
 		_settings_newgame.difficulty.quantity_sea_lakes = CUSTOM_SEA_LEVEL_MIN_PERCENTAGE;
 	}