diff --git a/src/main/java/com/sk89q/worldedit/EditSession.java b/src/main/java/com/sk89q/worldedit/EditSession.java
index 8e07952a3..59b26cee0 100644
--- a/src/main/java/com/sk89q/worldedit/EditSession.java
+++ b/src/main/java/com/sk89q/worldedit/EditSession.java
@@ -234,7 +234,7 @@ public class EditSession {
                 result = world.setBlockType(pt, 0);
             }
         } else {
-            result = world.setBlock(pt, block, fastMode);
+            result = world.setBlock(pt, block, !fastMode);
         }
         
         return result;
diff --git a/src/main/java/com/sk89q/worldedit/bukkit/DefaultNmsBlock.java b/src/main/java/com/sk89q/worldedit/bukkit/DefaultNmsBlock.java
index 6ff3cf308..dee9a7ee0 100644
--- a/src/main/java/com/sk89q/worldedit/bukkit/DefaultNmsBlock.java
+++ b/src/main/java/com/sk89q/worldedit/bukkit/DefaultNmsBlock.java
@@ -259,14 +259,10 @@ public class DefaultNmsBlock extends NmsBlock {
             world.copyToWorld(position, (BaseBlock) block);
         }
 
-        changed = craftWorld.getHandle().setData(x, y, z, block.getData(), 0);
-
-        if (changed) {
-            if (notifyAdjacent) {
-                craftWorld.getHandle().update(x, y, z, block.getId());
-            } else {
-                craftWorld.getHandle().notify(x, y, z);
-            }
+        changed = craftWorld.getHandle().setData(x, y, z, block.getData(), 0) || changed;
+        if (changed && notifyAdjacent) {
+            craftWorld.getHandle().notify(x, y, z);
+            craftWorld.getHandle().update(x, y, z, block.getId());
         }
 
         return changed;