diff --git a/src/main/java/com/sk89q/worldedit/forge/compat/ArchitectureCraftBlockTransformHook.java b/src/main/java/com/sk89q/worldedit/forge/compat/ArchitectureCraftBlockTransformHook.java
index 6165ffb..7bcb332 100644
--- a/src/main/java/com/sk89q/worldedit/forge/compat/ArchitectureCraftBlockTransformHook.java
+++ b/src/main/java/com/sk89q/worldedit/forge/compat/ArchitectureCraftBlockTransformHook.java
@@ -92,10 +92,11 @@ public BaseBlock transformBlock(BaseBlock block, Transform transform) {
             } else {
                 int idx = rotationIndex(z_rotations, side);
                 side = z_rotations[(idx + 4 - ticks) % 4];
-                turn = (byte) ((turn - ticks) % 4);
+                turn = (byte) ((turn + 4 - ticks) % 4);
             }
         }
         CompoundTagBuilder newNbt = nbt.createBuilder();
+        turn = (byte) ((turn + 4) % 4); // make sure turn is positive
         newNbt.putByte("side", side);
         newNbt.putByte("turn", turn);
         return new BaseBlock(block.getId(), block.getData(), newNbt.build());