diff --git a/src/main/resources/mappings/spigot2srg.srg b/src/main/resources/mappings/spigot2srg.srg
index 66233081f7..a80e4494f8 100644
--- a/src/main/resources/mappings/spigot2srg.srg
+++ b/src/main/resources/mappings/spigot2srg.srg
@@ -193,6 +193,9 @@ CL: net/minecraft/server/BehaviorWorkComposter net/minecraft/entity/ai/brain/tas
 CL: net/minecraft/server/Behaviors net/minecraft/entity/ai/brain/task/VillagerTasks
 CL: net/minecraft/server/BehavorMove net/minecraft/entity/ai/brain/task/WalkToTargetTask
 CL: net/minecraft/server/BiomeBase net/minecraft/world/biome/Biome
+CL: net/minecraft/server/BiomeBase$a net/minecraft/world/biome/Biome$Builder
+CL: net/minecraft/server/BiomeBase$d net/minecraft/world/biome/Biome$Climate
+CL: net/minecraft/server/BiomeBase$c net/minecraft/world/biome/Biome$Attributes
 CL: net/minecraft/server/BiomeBase$Geography net/minecraft/world/biome/Biome$Category
 CL: net/minecraft/server/BiomeBase$Precipitation net/minecraft/world/biome/Biome$RainType
 CL: net/minecraft/server/BiomeBase$TemperatureModifier net/minecraft/world/biome/Biome$TemperatureModifier