diff --git a/openmc/deplete/operator.py b/openmc/deplete/operator.py
index 1c0d0e492..a15cd35fa 100644
--- a/openmc/deplete/operator.py
+++ b/openmc/deplete/operator.py
@@ -112,9 +112,6 @@ class Operator(TransportOperator):
 
             # Store previous results in operator
             self.prev_res = prev_results
-
-            # Get number densities from previous results
-            #self.number = prev_results
         else:
             self.prev_res = None