diff --git a/biomeidentifier.cpp b/biomeidentifier.cpp
index 77c30aba..fddbf259 100644
--- a/biomeidentifier.cpp
+++ b/biomeidentifier.cpp
@@ -118,7 +118,7 @@ QColor BiomeInfo::mixColor( QColor colorizer, QColor blockcolor )
 }
 
 
-QColor BiomeInfo::getBiomeGrassColor( QColor blockcolor, int elevation )
+QColor BiomeInfo::getBiomeGrassColor( QColor blockcolor, int elevation ) const
 {
   QColor colorizer;
   // remove variants from ID
@@ -148,7 +148,7 @@ QColor BiomeInfo::getBiomeGrassColor( QColor blockcolor, int elevation )
   return mixColor( colorizer, blockcolor );
 }
 
-QColor BiomeInfo::getBiomeFoliageColor( QColor blockcolor, int elevation )
+QColor BiomeInfo::getBiomeFoliageColor( QColor blockcolor, int elevation ) const
 {
   QColor colorizer;
   // remove variants from ID
@@ -167,7 +167,7 @@ QColor BiomeInfo::getBiomeFoliageColor( QColor blockcolor, int elevation )
   return mixColor( colorizer, blockcolor );
 }
 
-QColor BiomeInfo::getBiomeWaterColor( QColor watercolor )
+QColor BiomeInfo::getBiomeWaterColor( QColor watercolor ) const
 {
   if (this->enabledwatermodifier) {
     // calculate modified color components
@@ -201,13 +201,13 @@ BiomeIdentifier& BiomeIdentifier::Instance() {
   return singleton;
 }
 
-BiomeInfo &BiomeIdentifier::getBiome(int biome) {
+const BiomeInfo &BiomeIdentifier::getBiome(int biome) const {
   auto itr = biomes.find(biome);
   if (itr == biomes.end())
   {
     return unknownBiome;
   }
-  QList<BiomeInfo*> &list = *itr;
+  const QList<BiomeInfo*> &list = *itr;
   // search backwards for priority sorting to work
   for (int i = list.length() - 1; i >= 0; i--)
     if (list[i]->enabled)
diff --git a/biomeidentifier.h b/biomeidentifier.h
index 9275a18a..c311ad81 100644
--- a/biomeidentifier.h
+++ b/biomeidentifier.h
@@ -13,9 +13,9 @@ class BiomeInfo {
   // public methods
  public:
   BiomeInfo();
-  QColor getBiomeGrassColor  ( QColor blockcolor, int elevation );
-  QColor getBiomeFoliageColor( QColor blockcolor, int elevation );
-  QColor getBiomeWaterColor( QColor watercolor );
+  QColor getBiomeGrassColor  ( QColor blockcolor, int elevation ) const;
+  QColor getBiomeFoliageColor( QColor blockcolor, int elevation ) const;
+  QColor getBiomeWaterColor( QColor watercolor ) const;
 
   // public members
  public:
@@ -50,7 +50,7 @@ class BiomeIdentifier {
   int addDefinitions(JSONArray *, int pack = -1);
   void enableDefinitions(int id);
   void disableDefinitions(int id);
-  BiomeInfo &getBiome(int id);
+  const BiomeInfo &getBiome(int id) const;
 
 private:
   // singleton: prevent access to constructor and copyconstructor