diff --git a/src/pocketmine/level/generator/normal/biome/ForestBiome.php b/src/pocketmine/level/generator/normal/biome/ForestBiome.php
index 2c0b5a3e4..563935511 100644
--- a/src/pocketmine/level/generator/normal/biome/ForestBiome.php
+++ b/src/pocketmine/level/generator/normal/biome/ForestBiome.php
@@ -49,11 +49,11 @@ class ForestBiome extends GrassyBiome{
 		$this->setElevation(63, 81);
 
 		if($type === self::TYPE_BIRCH){
-			$this->temperature = 0.5;
+			$this->temperature = 0.6;
 			$this->rainfall = 0.5;
 		}else{
 			$this->temperature = 0.7;
-			$this->temperature = 0.8;
+			$this->rainfall = 0.8;
 		}
 	}