diff --git a/src/org/ntlab/traceDebugger/TracePoints.java b/src/org/ntlab/traceDebugger/TracePoints.java
index 45f3a19..b152466 100644
--- a/src/org/ntlab/traceDebugger/TracePoints.java
+++ b/src/org/ntlab/traceDebugger/TracePoints.java
@@ -16,6 +16,10 @@
 		return tracePoints.toArray(new TracePoint[tracePoints.size()]);
 	}
 	
+	public boolean contains(TracePoint tp) {
+		return tracePoints.contains(tp);
+	}
+	
 	public void add(TracePoint tp) {
 		tracePoints.add(tp);
 	}
diff --git a/src/org/ntlab/traceDebugger/TracePointsView.java b/src/org/ntlab/traceDebugger/TracePointsView.java
index 3fb12b6..f561e17 100644
--- a/src/org/ntlab/traceDebugger/TracePointsView.java
+++ b/src/org/ntlab/traceDebugger/TracePointsView.java
@@ -182,8 +182,10 @@
 	}
 	
 	public void addTracePoint(TracePoint tp) {
-		tracePoints.add(tp);
-		update();
+		if (!(tracePoints.contains(tp))) {
+			tracePoints.add(tp);
+			update();			
+		}
 	}
 
 	public void reset() {