1 files changed, 14 insertions, 2 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/grouping/request/MathACosHFunction.java b/container-search/src/main/java/com/yahoo/search/grouping/request/MathACosHFunction.java
index eca8fd7ebf7..40de58ba0be 100644
--- a/container-search/src/main/java/com/yahoo/search/grouping/request/MathACosHFunction.java
+++ b/container-search/src/main/java/com/yahoo/search/grouping/request/MathACosHFunction.java
@@ -5,14 +5,26 @@ import java.util.Arrays;
 
 /**
  * @author baldersheim
+ * @author bratseth
  */
 public class MathACosHFunction extends FunctionNode {
-/**
+
+    /**
      * Constructs a new instance of this class.
      *
      * @param exp The expression to evaluate, double value will be requested.
      */
     public MathACosHFunction(GroupingExpression exp) {
-        super("math.acosh", Arrays.asList(exp));
+        this(null, null, exp);
+    }
+
+    private MathACosHFunction(String label, Integer level, GroupingExpression exp) {
+        super("math.acosh", label, level, Arrays.asList(exp));
     }
+
+    @Override
+    public MathACosHFunction copy() {
+        return new MathACosHFunction(getLabel(), getLevelOrNull(), getArg(0).copy());
+    }
+
 }