diff --git a/examples/sky-shell/src/se/sics/contiki/collect/gui/PacketChartPanel.java b/examples/sky-shell/src/se/sics/contiki/collect/gui/PacketChartPanel.java
index a30f386ef..6f57ef06b 100644
--- a/examples/sky-shell/src/se/sics/contiki/collect/gui/PacketChartPanel.java
+++ b/examples/sky-shell/src/se/sics/contiki/collect/gui/PacketChartPanel.java
@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: PacketChartPanel.java,v 1.3 2010/09/13 12:22:18 nifi Exp $
+ * $Id: PacketChartPanel.java,v 1.4 2010/09/14 10:44:07 adamdunkels Exp $
  *
  * -----------------------------------------------------------------
  *
@@ -34,8 +34,8 @@
  *
  * Authors : Joakim Eriksson, Niclas Finne
  * Created : 6 sep 2010
- * Updated : $Date: 2010/09/13 12:22:18 $
- *           $Revision: 1.3 $
+ * Updated : $Date: 2010/09/14 10:44:07 $
+ *           $Revision: 1.4 $
  */
 
 package se.sics.contiki.collect.gui;
@@ -155,15 +155,15 @@ public class PacketChartPanel extends JPanel implements Visualizer {
           if (sd.isDuplicate()) {
             duplicates++;
           } else {
-            long min = sd.getSystemTime() / 60000;
+            long min = sd.getNodeTime() / 60000;
             if (min != minute) {
               if (lastMinute < minute) {
-                series.add(new Minute(new Date(lastMinute * 60000L)), 0);
+                series.addOrUpdate(new Minute(new Date(lastMinute * 60000L)), 0);
                 if (lastMinute < minute - 1) {
-                  series.add(new Minute(new Date((minute - 1) * 60000L)), 0);
+                  series.addOrUpdate(new Minute(new Date((minute - 1) * 60000L)), 0);
                 }
               }
-              series.add(new Minute(new Date(minute * 60000L)), count);
+              series.addOrUpdate(new Minute(new Date(minute * 60000L)), count);
               count = 0;
               lastMinute = minute + 1;
               minute = min;