diff --git a/Model/main.py b/Model/main.py
index ac567cc..4af219e 100644
--- a/Model/main.py
+++ b/Model/main.py
@@ -77,7 +77,7 @@
         # with_fb_coins_dist=True,
         with_cum_op_cost=True,
         with_divergence=True,
-        # with_overpayments=True,
+        with_overpayments=True,
     )
 
     start_block = 350000
diff --git a/Model/simulation.py b/Model/simulation.py
index d7d9090..9a512f6 100644
--- a/Model/simulation.py
+++ b/Model/simulation.py
@@ -320,7 +320,8 @@ def cancel(self, block_height):
         # Compute overpayments
         if self.with_overpayments:
             feerate = self.wt.next_block_feerate(block_height)
-            self.overpayments.append([block_height, self.cancel_fee - feerate])
+            needed_fee = self.wt.cancel_tx_fee(feerate, len(cancel_inputs))
+            self.overpayments.append([block_height, self.cancel_fee - needed_fee])
 
     def catastrophe_sequence(self, block_height):
         if len(self.wt.list_available_vaults()) == 0: