diff --git a/src/main/java/carpet/mixins/ThreadedAnvilChunkStorage_scarpetChunkCreationMixin.java b/src/main/java/carpet/mixins/ThreadedAnvilChunkStorage_scarpetChunkCreationMixin.java
index c0856d9d..f833b8e2 100644
--- a/src/main/java/carpet/mixins/ThreadedAnvilChunkStorage_scarpetChunkCreationMixin.java
+++ b/src/main/java/carpet/mixins/ThreadedAnvilChunkStorage_scarpetChunkCreationMixin.java
@@ -72,7 +72,8 @@ public abstract class ThreadedAnvilChunkStorage_scarpetChunkCreationMixin implem
 
     //in method_20617
     //method_19534(Lnet/minecraft/server/world/ChunkHolder;Lnet/minecraft/world/chunk/Chunk;)Ljava/util/concurrent/CompletableFuture;
-    @Inject(method = "method_19534", at = @At(
+    // incmopatibility with optifine makes this mixin fail.
+    @Inject(method = "method_19534", require = 0, at = @At(
             value = "INVOKE",
             target = "Lnet/minecraft/server/world/ThreadedAnvilChunkStorage;convertToFullChunk(Lnet/minecraft/server/world/ChunkHolder;)Ljava/util/concurrent/CompletableFuture;",
             shift = At.Shift.AFTER