diff --git a/core/probabilitybuckets_light.py b/core/probabilitybuckets_light.py
index 53ce33c..412a532 100644
--- a/core/probabilitybuckets_light.py
+++ b/core/probabilitybuckets_light.py
@@ -668,7 +668,7 @@ def create_bucket_distribution(self, delta_func, DP_type):
 
             elif DP_type == 'pdp':  # assuming delta_func describes probabilistic differential privacy
                 G = np.ones((self.number_of_buckets + 1, self.number_of_buckets + 1))
-                G = G[np.tril_indices(self.number_of_buckets + 1, -1)] = 0
+                G[np.tril_indices(self.number_of_buckets + 1, -1)] = 0
 
             else:
                 raise NotImplementedError("DP_type '{}' not implemented.".format(DP_type))