diff --git a/worldedit-core/src/main/java/com/boydti/fawe/util/MaskTraverser.java b/worldedit-core/src/main/java/com/boydti/fawe/util/MaskTraverser.java
index 24db5ec76..a5e4897ff 100644
--- a/worldedit-core/src/main/java/com/boydti/fawe/util/MaskTraverser.java
+++ b/worldedit-core/src/main/java/com/boydti/fawe/util/MaskTraverser.java
@@ -2,6 +2,7 @@ package com.boydti.fawe.util;
 
 import com.boydti.fawe.object.mask.ResettableMask;
 import com.sk89q.worldedit.extent.Extent;
+import com.sk89q.worldedit.function.mask.AbstractExtentMask;
 import com.sk89q.worldedit.function.mask.Mask;
 import java.lang.reflect.Field;
 import java.util.Collection;
@@ -26,11 +27,16 @@ public class MaskTraverser {
         }
         Class<?> current = mask.getClass();
         while (current.getSuperclass() != null) {
-            try {
-                Field field = current.getDeclaredField("extent");
-                field.setAccessible(true);
-                field.set(mask, newExtent);
-            } catch (NoSuchFieldException | IllegalAccessException ignored) {
+            if (mask instanceof AbstractExtentMask) {
+                AbstractExtentMask mask1 = (AbstractExtentMask) mask;
+                mask1.setExtent(newExtent);
+            } else {
+                try {
+                    Field field = current.getDeclaredField("extent");
+                    field.setAccessible(true);
+                    field.set(mask, newExtent);
+                } catch (NoSuchFieldException | IllegalAccessException ignored) {
+                }
             }
             try {
                 Field field = current.getDeclaredField("mask");