diff --git a/src/main/java/com/metaweb/gridworks/clustering/knn/kNNClusterer.java b/src/main/java/com/metaweb/gridworks/clustering/knn/kNNClusterer.java
index 98eed7a01..b35cd1e9d 100644
--- a/src/main/java/com/metaweb/gridworks/clustering/knn/kNNClusterer.java
+++ b/src/main/java/com/metaweb/gridworks/clustering/knn/kNNClusterer.java
@@ -114,7 +114,7 @@ public class kNNClusterer extends Clusterer {
         }
         
         public boolean visit(Project project, int rowIndex, Row row, boolean contextual) {
-            Cell cell = row.cells.get(_colindex);
+            Cell cell = row.getCell(_colindex);
             if (cell != null && cell.value != null) {
                 Object v = cell.value;
                 String s = (v instanceof String) ? ((String) v) : v.toString().intern();