diff --git a/li.strolch.utils/src/main/java/li/strolch/utils/collections/MapOfMaps.java b/li.strolch.utils/src/main/java/li/strolch/utils/collections/MapOfMaps.java
index 890083b06..37606ea6e 100644
--- a/li.strolch.utils/src/main/java/li/strolch/utils/collections/MapOfMaps.java
+++ b/li.strolch.utils/src/main/java/li/strolch/utils/collections/MapOfMaps.java
@@ -19,6 +19,7 @@ import java.util.*;
 import java.util.Map.Entry;
 import java.util.function.BiConsumer;
 import java.util.function.Function;
+import java.util.function.Supplier;
 import java.util.stream.Stream;
 
 /**
@@ -228,6 +229,12 @@ public class MapOfMaps<T, U, V> {
 		return u;
 	}
 
+	public V computeIfAbsent(T t, U u, Supplier<V> mappingFunction) {
+		Objects.requireNonNull(mappingFunction);
+		Map<U, V> uvMap = this.mapOfMaps.computeIfAbsent(t, k -> getMap());
+		return uvMap.computeIfAbsent(u, k -> mappingFunction.get());
+	}
+
 	public void forEach(BiConsumer<? super T, ? super Map<U, V>> action) {
 		Objects.requireNonNull(action);
 		for (Map.Entry<T, Map<U, V>> entry : this.mapOfMaps.entrySet()) {