diff --git a/Minecraft.World/Stats/Achievement.cpp b/Minecraft.World/Stats/Achievement.cpp
index dd25cd342..b690b682b 100644
--- a/Minecraft.World/Stats/Achievement.cpp
+++ b/Minecraft.World/Stats/Achievement.cpp
@@ -1,9 +1,9 @@
+#include "../Platform/stdafx.h"
 #include "../Headers/net.minecraft.locale.h"
 #include "../Items/ItemInstance.h"
-#include "../Platform/stdafx.h"
+#include "Achievements.h"
 #include "../Util/DescFormatter.h"
 #include "Achievement.h"
-#include "Achievements.h"
 
 /**
  * @brief Performs internal initialization for the achievement.
diff --git a/Minecraft.World/WorldGen/Biomes/FixedBiomeSource.cpp b/Minecraft.World/WorldGen/Biomes/FixedBiomeSource.cpp
index 4211537a1..cebeea73d 100644
--- a/Minecraft.World/WorldGen/Biomes/FixedBiomeSource.cpp
+++ b/Minecraft.World/WorldGen/Biomes/FixedBiomeSource.cpp
@@ -99,13 +99,12 @@ void FixedBiomeSource::getTemperatureBlock(doubleArray& temperatures, int x,
  */
 void FixedBiomeSource::getDownfallBlock(floatArray& downfalls, int x, int z,
                                         int w, int h) const {
-    if (!downfalls.data || downfalls.length < w * h) {
-        if (downfalls.data) delete[] downfalls.data;
+    if (downfalls.data == NULL || downfalls.length < w * h) {
+        if (downfalls.data != NULL) delete[] downfalls.data;
         downfalls = floatArray(w * h);
     }
     Arrays::fill(downfalls, 0, w * h, downfall);
 }
-
 /**
  * @brief Returns a floatArray filled with downfall values.
  */
@@ -124,7 +123,7 @@ float FixedBiomeSource::getDownfall(int x, int z) const { return downfall; }
 /**
  * @brief Fills a double array with downfall values.
  */
-void FixedBiomeSource::getDownfallBlock(doubleArray downfalls, int x, int z,
+void FixedBiomeSource::getDownfallBlock(doubleArray& downfalls, int x, int z,
                                         int w, int h) {
     if (!downfalls.data || downfalls.length < w * h) {
         if (downfalls.data) delete[] downfalls.data;
diff --git a/Minecraft.World/WorldGen/Biomes/FixedBiomeSource.h b/Minecraft.World/WorldGen/Biomes/FixedBiomeSource.h
index 4148e3b2e..fea35d8dc 100644
--- a/Minecraft.World/WorldGen/Biomes/FixedBiomeSource.h
+++ b/Minecraft.World/WorldGen/Biomes/FixedBiomeSource.h
@@ -1,16 +1,16 @@
 #pragma once
+#include <vector>
+
 #include "BiomeSource.h"
 
 class FixedBiomeSource : public BiomeSource {
-private:
+   private:
     Biome* biome;
     float temperature, downfall;
 
-public:
+   public:
     using BiomeSource::getTemperature;
-
     FixedBiomeSource(Biome* fixed, float temperature, float downfall);
-
     virtual Biome* getBiome(ChunkPos* cp);
     virtual Biome* getBiome(int x, int z);
     virtual float getTemperature(int x, int z);
@@ -23,23 +23,23 @@ public:
                                   int h) const;
     virtual floatArray getDownfallBlock(int x, int z, int w, int h) const;
     virtual float getDownfall(int x, int z) const;
-    virtual void getDownfallBlock(doubleArray downfalls, int x, int z, int w,
+    virtual void getDownfallBlock(doubleArray& downfalls, int x, int z, int w,
                                   int h);
     virtual void getBiomeBlock(BiomeArray& biomes, int x, int z, int w, int h,
                                bool useCache) const;
     virtual void getBiomeIndexBlock(byteArray& biomeIndices, int x, int z,
                                     int w, int h, bool useCache) const;
-
     // 4J-PB added in from beyond 1.8.2
     virtual BiomeArray getRawBiomeBlock(int x, int z, int w, int h) const;
     virtual void getRawBiomeBlock(BiomeArray& biomes, int x, int z, int w,
                                   int h) const;
-
-    ////////////////////////////////////
     virtual TilePos* findBiome(int x, int z, int r, Biome* toFind,
                                Random* random);
-    virtual TilePos* findBiome(int x, int z, int r, std::vector<Biome*> allowed,
+    virtual TilePos* findBiome(int x, int z, int r,
+                               const std::vector<Biome*>& allowed,
                                Random* random);
     virtual bool containsOnly(int x, int z, int r, Biome* allowed);
-    virtual bool containsOnly(int x, int z, int r, std::vector<Biome*> allowed);
+    virtual bool containsOnly(
+        int x, int z, int r,
+        const std::vector<Biome*>& allowed);
 };