diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/function/mask/BlockCategoryMask.java b/worldedit-core/src/main/java/com/sk89q/worldedit/function/mask/BlockCategoryMask.java
index 75b8b34877..39aecb5fc4 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/function/mask/BlockCategoryMask.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/function/mask/BlockCategoryMask.java
@@ -53,7 +53,7 @@ public boolean test(BlockVector3 vector) {
     //FAWE start
     @Override
     public boolean test(Extent extent, BlockVector3 vector) {
-        return category.contains(extent.getBlock(vector));
+        return category.contains(vector.getBlock(extent));
     }
 
     /**