diff --git a/src/mapgen_functions.h b/src/mapgen_functions.h
index a41487861ef74..0c4b0939a88f6 100644
--- a/src/mapgen_functions.h
+++ b/src/mapgen_functions.h
@@ -76,7 +76,8 @@ bool apply_construction_marker( const update_mapgen_id &update_mapgen_id,
                                 const mapgen_arguments &args, bool mirror_horizontal,
                                 bool mirror_vertical, int rotation, bool apply );
 std::pair<std::map<ter_id, int>, std::map<furn_id, int>> get_changed_ids_from_update(
-            const update_mapgen_id &, const mapgen_arguments &, ter_id const &base_ter = ter_str_id( "t_dirt" ).id() );
+            const update_mapgen_id &, const mapgen_arguments &,
+            ter_id const &base_ter = ter_str_id( "t_dirt" ).id() );
 mapgen_parameters get_map_special_params( const std::string &mapgen_id );
 
 void resolve_regional_terrain_and_furniture( const mapgendata &dat );