diff --git a/mods/default/mapgen.lua b/mods/default/mapgen.lua
index 53e7e4cc83..2680bc3cc2 100644
--- a/mods/default/mapgen.lua
+++ b/mods/default/mapgen.lua
@@ -8,6 +8,7 @@ minetest.register_alias("mapgen_dirt", "default:dirt")
 minetest.register_alias("mapgen_dirt_with_grass", "default:dirt_with_grass")
 minetest.register_alias("mapgen_sand", "default:sand")
 minetest.register_alias("mapgen_water_source", "default:water_source")
+minetest.register_alias("mapgen_river_water_source", "default:river_water_source")
 minetest.register_alias("mapgen_lava_source", "default:lava_source")
 minetest.register_alias("mapgen_gravel", "default:gravel")
 minetest.register_alias("mapgen_desert_stone", "default:desert_stone")