diff --git a/api/src/main/java/net/md_5/bungee/api/plugin/PluginManager.java b/api/src/main/java/net/md_5/bungee/api/plugin/PluginManager.java
index feb124c8..0613b50e 100644
--- a/api/src/main/java/net/md_5/bungee/api/plugin/PluginManager.java
+++ b/api/src/main/java/net/md_5/bungee/api/plugin/PluginManager.java
@@ -44,7 +44,7 @@ public class PluginManager
         commandMap.put(command.getName().toLowerCase(), command);
         for (String alias : command.getAliases())
         {
-            commandMap.put(alias, command);
+            commandMap.put(alias.toLowerCase(), command);
         }
     }