diff --git a/samoa-api/src/main/java/org/apache/samoa/learners/clusterers/ClusterInputInstance.java b/samoa-api/src/main/java/org/apache/samoa/learners/clusterers/ClusterInputInstance.java
index 53bf4a78..813097ea 100644
--- a/samoa-api/src/main/java/org/apache/samoa/learners/clusterers/ClusterInputInstance.java
+++ b/samoa-api/src/main/java/org/apache/samoa/learners/clusterers/ClusterInputInstance.java
@@ -55,7 +55,7 @@ private InstancesHeader generateHeader() {
 
     @Override
     public Instance getInstance() {
-        Instance inst = new DenseInstance(1.0, data);
+        Instance inst = new DenseInstance(1.0, this.data);
         inst.setDataset(generateHeader());
         return new DataPoint(inst, this.timeStamp);
     }