diff --git a/mapgen.lua b/mapgen.lua
index 78fb463..f2a1cd5 100644
--- a/mapgen.lua
+++ b/mapgen.lua
@@ -7,6 +7,7 @@ local function select_biome(biomes, temperature, humidity)
         local score = math.abs(temperature - biome.temperature) + math.abs(humidity - biome.humidity)
         if not selected_biome or score > selected_score then
             selected_biome = biome
+            selected_score = score
         end
     end