diff --git a/src/Model/DataBase.java b/src/Model/DataBase.java
index ecb9611..3f033a5 100644
--- a/src/Model/DataBase.java
+++ b/src/Model/DataBase.java
@@ -628,6 +628,11 @@ public Point2D getU(Point2D p, Point2D prev, Point2D next) {
 	}
 
 	
+	public void updateUp(Point2D p, Point2D c)
+	{
+		u_p.replace(p, c);
+	}
+	
 	//-----------O(n)----------------
 	public void addAllUpToK() 
 	{		
diff --git a/src/Model/NeighborVoronoiDiagram.java b/src/Model/NeighborVoronoiDiagram.java
index 5fe3dc4..961cfb9 100644
--- a/src/Model/NeighborVoronoiDiagram.java
+++ b/src/Model/NeighborVoronoiDiagram.java
@@ -38,6 +38,7 @@ public void computeVoronoiDiagram()
 				dataBase.addCandUtoE(c, dataBase.getUp2(p));
 				dataBase.addCandUtoE(c, dataBase.getUp2(before_p));
 				//u(q)=c;
+				dataBase.updateUp(before_p, c);
 				dataBase.deleteMaxP();
 				n = n-1;
 			}while(n != 2);