diff --git a/lib/src/main/java/net/tomatentum/marinara/util/ObjectListAggregator.java b/lib/src/main/java/net/tomatentum/marinara/util/ObjectListAggregator.java
index 9494467..c3ec89a 100644
--- a/lib/src/main/java/net/tomatentum/marinara/util/ObjectListAggregator.java
+++ b/lib/src/main/java/net/tomatentum/marinara/util/ObjectListAggregator.java
@@ -5,7 +5,7 @@ import java.util.function.Function;
 
 public class ObjectListAggregator<O, K, V> extends ObjectAggregator<O, K, ArrayList<V>> {
 
-    public ObjectListAggregator(Function<O, K> keySupplier, Function<O, V> valueConsumer) {
+    public ObjectListAggregator(Function<O, Iterable<K>> keySupplier, Function<O, V> valueConsumer) {
         super(keySupplier, 
         (l, o) -> l.add(valueConsumer.apply(o)),
         () -> new ArrayList<>());