diff --git a/Python3Code/Chapter5/Clustering.py b/Python3Code/Chapter5/Clustering.py
index 71284a65..87b73cba 100755
--- a/Python3Code/Chapter5/Clustering.py
+++ b/Python3Code/Chapter5/Clustering.py
@@ -145,7 +145,7 @@ def compute_distance_matrix_instances(self, dataset, distance_metric):
         DM = InstanceDistanceMetrics()
 
         # Define the ranges of the columns if we use the gower distance.
-        ranges = []
+        self.ranges = []
         if distance_metric == self.gower:
             for col in dataset.columns:
                 self.ranges.append(dataset[col].max() - dataset[col].min())