1 files changed, 14 insertions, 2 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/grouping/request/MathTanHFunction.java b/container-search/src/main/java/com/yahoo/search/grouping/request/MathTanHFunction.java
index 93e7c1c1d49..86ccbbdfcf9 100644
--- a/container-search/src/main/java/com/yahoo/search/grouping/request/MathTanHFunction.java
+++ b/container-search/src/main/java/com/yahoo/search/grouping/request/MathTanHFunction.java
@@ -5,14 +5,26 @@ import java.util.Arrays;
 
 /**
  * @author baldersheim
+ * @author bratseth
  */
 public class MathTanHFunction extends FunctionNode {
-/**
+
+    /**
      * Constructs a new instance of this class.
      *
      * @param exp The expression to evaluate, double value will be requested.
      */
     public MathTanHFunction(GroupingExpression exp) {
-        super("math.tanh", Arrays.asList(exp));
+        this(null, null, exp);
+    }
+
+    private MathTanHFunction(String label, Integer level, GroupingExpression exp) {
+        super("math.tanh", label, level, Arrays.asList(exp));
     }
+
+    @Override
+    public MathTanHFunction copy() {
+        return new MathTanHFunction(getLabel(), getLevelOrNull(), getArg(0).copy());
+    }
+
 }