diff --git a/src/main/java/de/neemann/digital/core/wiring/Splitter.java b/src/main/java/de/neemann/digital/core/wiring/Splitter.java
index 69021ee72..5cf742e07 100644
--- a/src/main/java/de/neemann/digital/core/wiring/Splitter.java
+++ b/src/main/java/de/neemann/digital/core/wiring/Splitter.java
@@ -5,7 +5,6 @@ import de.neemann.digital.core.element.*;
 import de.neemann.digital.lang.Lang;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Iterator;
 import java.util.StringTokenizer;
 
@@ -257,7 +256,6 @@ public class Splitter implements Element {
     }
 
     private static final class Port {
-
         private final String name;
         private final int bits;
         private final int pos;
@@ -288,17 +286,4 @@ public class Splitter implements Element {
         }
     }
 
-    /**
-     * combines two arrays of {@link ObservableValue}s to a single array.
-     *
-     * @param inputs  first array
-     * @param outputs second array
-     * @return the combined array
-     */
-    public static ObservableValue[] combine(ObservableValue[] inputs, ObservableValue[] outputs) {
-        ObservableValue[] com = Arrays.copyOf(inputs, inputs.length + outputs.length);
-        System.arraycopy(outputs, 0, com, inputs.length, outputs.length);
-        return com;
-    }
-
 }