diff --git a/Common/src/main/java/com/blamejared/crafttweaker/mixin/common/access/block/AccessBlockBehaviour.java b/Common/src/main/java/com/blamejared/crafttweaker/mixin/common/access/block/AccessBlockBehaviour.java
index 6a694f5dc..0a8ea7992 100644
--- a/Common/src/main/java/com/blamejared/crafttweaker/mixin/common/access/block/AccessBlockBehaviour.java
+++ b/Common/src/main/java/com/blamejared/crafttweaker/mixin/common/access/block/AccessBlockBehaviour.java
@@ -3,6 +3,7 @@
 import net.minecraft.world.level.block.state.BlockBehaviour;
 import net.minecraft.world.level.material.Material;
 import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Mutable;
 import org.spongepowered.asm.mixin.gen.Accessor;
 
 @Mixin(BlockBehaviour.class)
@@ -11,36 +12,42 @@ public interface AccessBlockBehaviour {
     @Accessor("friction")
     float getFriction();
     
+    @Mutable
     @Accessor("friction")
     void setFriction(float value);
     
     @Accessor("speedFactor")
     float getSpeedFactor();
     
+    @Mutable
     @Accessor("speedFactor")
     void setSpeedFactor(float value);
     
     @Accessor("jumpFactor")
     float getJumpFactor();
     
+    @Mutable
     @Accessor("jumpFactor")
     void setJumpFactor(float value);
     
     @Accessor("hasCollision")
     boolean getHasCollision();
     
+    @Mutable
     @Accessor("hasCollision")
     void setHasCollision(boolean value);
     
     @Accessor("explosionResistance")
     float getExplosionResistance();
     
+    @Mutable
     @Accessor("explosionResistance")
     void setExplosionResistance(float value);
     
     @Accessor("material")
     Material getMaterial();
     
+    @Mutable
     @Accessor("material")
     void setMaterial(Material value);