diff --git a/EssentialsGroupManager/src/org/anjocaido/groupmanager/GroupManager.java b/EssentialsGroupManager/src/org/anjocaido/groupmanager/GroupManager.java
index a971dec88..d415182b0 100644
--- a/EssentialsGroupManager/src/org/anjocaido/groupmanager/GroupManager.java
+++ b/EssentialsGroupManager/src/org/anjocaido/groupmanager/GroupManager.java
@@ -381,7 +381,7 @@ public class GroupManager extends JavaPlugin {
 		User senderUser = null;
 		boolean isOpOverride = config.isOpOverride();
 
-		if (sender.getClass().getName().equals("org.bukkit.command.BlockCommandSender")) {
+		if (sender.getClass().getName().equals("org.bukkit.craftbukkit.command.CraftBlockCommandSender")) {
 			sender.sendMessage(ChatColor.RED + "GM Commands can not be called from CommandBlocks");
 			return true;
 		}