diff --git a/cardano_node_tests/tests/tests_plutus/test_mint_negative_raw.py b/cardano_node_tests/tests/tests_plutus/test_mint_negative_raw.py
index 989cc4087..2a13bf457 100644
--- a/cardano_node_tests/tests/tests_plutus/test_mint_negative_raw.py
+++ b/cardano_node_tests/tests/tests_plutus/test_mint_negative_raw.py
@@ -752,7 +752,10 @@ def test_minting_with_insufficient_collateral(
         execution_cost = dataclasses.replace(plutus_v_record.execution_cost, fixed_cost=2_000_000)
 
         minting_cost = plutus_common.compute_cost(
-            execution_cost=execution_cost, protocol_params=cluster.g_query.get_protocol_params()
+            execution_cost=execution_cost,
+            protocol_params=cluster.g_query.get_protocol_params(),
+            # Will use the minimal default collateral amount
+            collateral_fraction_offset=0.0,
         )
 
         # Step 1: fund the token issuer
diff --git a/cardano_node_tests/tests/tests_plutus/test_spend_negative_raw.py b/cardano_node_tests/tests/tests_plutus/test_spend_negative_raw.py
index cc58f1aa6..61ff94dec 100644
--- a/cardano_node_tests/tests/tests_plutus/test_spend_negative_raw.py
+++ b/cardano_node_tests/tests/tests_plutus/test_spend_negative_raw.py
@@ -443,7 +443,8 @@ def test_collateral_percent(
             dst_addr=payment_addrs[1],
             plutus_op=plutus_op,
             amount=amount,
-            collateral_fraction_offset=0.9,
+            # Will use the minimal default collateral amount
+            collateral_fraction_offset=0.0,
         )
 
         with pytest.raises(clusterlib.CLIError) as excinfo: