diff --git a/src/main/java/de/pauljako/cosmeticserver/CosmeticSocket.java b/src/main/java/de/pauljako/cosmeticserver/CosmeticSocket.java
index e439e36..f39c81b 100644
--- a/src/main/java/de/pauljako/cosmeticserver/CosmeticSocket.java
+++ b/src/main/java/de/pauljako/cosmeticserver/CosmeticSocket.java
@@ -158,7 +158,7 @@ public class CosmeticSocket implements SocketHandler, ListenerAdapter {
 
         Collection<String> allowedUUIDs = access.getStringList(path);
 
-        return allowedUUIDs.contains(uuid.toUpperCase());
+        return allowedUUIDs.contains(uuid.toLowerCase());
     }
 
     @EventHandler