diff --git a/utilities/data_simulation/GenerateData.py b/utilities/data_simulation/GenerateData.py
index 5d46e57..f8980a4 100644
--- a/utilities/data_simulation/GenerateData.py
+++ b/utilities/data_simulation/GenerateData.py
@@ -18,7 +18,7 @@ def __init__(self, operator=None, rng=None):
         else:
             self._op = operator
         if rng is None:
-            self._rng = self._op
+            self._rng = self._op.random
         else:
             self._rng = rng