diff --git a/src/de/steamwar/command/SWTypeMapperCreator.java b/src/de/steamwar/command/SWTypeMapperCreator.java
index 33c5dcb..f21b0a8 100644
--- a/src/de/steamwar/command/SWTypeMapperCreator.java
+++ b/src/de/steamwar/command/SWTypeMapperCreator.java
@@ -19,10 +19,10 @@
 
 package de.steamwar.command;
 
-import java.util.List;
+import java.util.Collection;
 import java.util.function.BiFunction;
 import java.util.function.Function;
 
 public interface SWTypeMapperCreator<T extends AbstractTypeMapper<K, V>, K, V> {
-    T createTypeMapper(Function<String, V> mapper, BiFunction<K, String, List<String>> tabCompleter);
+    T createTypeMapper(Function<String, V> mapper, BiFunction<K, String, Collection<String>> tabCompleter);
 }