diff --git a/src/widgets/genworld_widget.h b/src/widgets/genworld_widget.h
--- a/src/widgets/genworld_widget.h
+++ b/src/widgets/genworld_widget.h
@@ -37,7 +37,6 @@ enum GenerateLandscapeWidgets {
 	WID_GL_SNOW_LEVEL_TEXT,             ///< Snow level.
 	WID_GL_SNOW_LEVEL_UP,               ///< Increase snow level.
 
-	WID_GL_TREE_PULLDOWN,               ///< Dropdown 'Tree algorithm'.
 	WID_GL_LANDSCAPE_PULLDOWN,          ///< Dropdown 'Land generator'.
 
 	WID_GL_HEIGHTMAP_NAME_TEXT,         ///< Heightmap name.