diff --git a/moa/src/main/java/com/yahoo/labs/samoa/instances/SparseInstance.java b/moa/src/main/java/com/yahoo/labs/samoa/instances/SparseInstance.java
index 1b8ff6e75..dd4bc5c0d 100644
--- a/moa/src/main/java/com/yahoo/labs/samoa/instances/SparseInstance.java
+++ b/moa/src/main/java/com/yahoo/labs/samoa/instances/SparseInstance.java
@@ -46,7 +46,7 @@ public SparseInstance(InstanceImpl inst) {
      * @param numberAttributes the number attributes
      */
     public SparseInstance(double numberAttributes) {
-        super(1, null, null, (int) numberAttributes);
+        super((int) numberAttributes);
     }
 
     /**