diff --git a/ax/analysis/plotly/tests/test_sensitivity.py b/ax/analysis/plotly/tests/test_sensitivity.py
index fd87c83bc46..80fbdcecb50 100644
--- a/ax/analysis/plotly/tests/test_sensitivity.py
+++ b/ax/analysis/plotly/tests/test_sensitivity.py
@@ -5,7 +5,6 @@
 
 # pyre-strict
 
-from itertools import product
 from unittest.mock import patch
 
 from ax.adapter.registry import Generators
diff --git a/ax/generators/random/sobol.py b/ax/generators/random/sobol.py
index 3948e3e0f32..8c76ca854e3 100644
--- a/ax/generators/random/sobol.py
+++ b/ax/generators/random/sobol.py
@@ -66,7 +66,9 @@ def init_engine(self, n_tunable_features: int) -> SobolEngine:
         if not self._engine:
             self._engine = SobolEngine(
                 dimension=n_tunable_features, scramble=self.scramble, seed=self.seed
-            ).fast_forward(self.init_position)
+            )
+            if self.init_position > 0:
+                self._engine.fast_forward(self.init_position)
         return self._engine
 
     @property