diff --git a/src/full_node/blockchain.py b/src/full_node/blockchain.py
index b71e8b2f2a770..7abc7102c1bdb 100644
--- a/src/full_node/blockchain.py
+++ b/src/full_node/blockchain.py
@@ -635,7 +635,10 @@ class Blockchain:
         if not block.transactions_generator:
             return Err.UNKNOWN
         # Get List of names removed, puzzles hashes for removed coins and conditions crated
-        error, npc_list, cost = calculate_cost_of_program(block.transactions_generator)
+        error, npc_list, cost = calculate_cost_of_program(
+            block.transactions_generator,
+            self.constants["CLVM_COST_RATIO_CONSTANT"]
+        )
 
         # 2. Check that cost <= MAX_BLOCK_COST_CLVM
         if cost > self.constants["MAX_BLOCK_COST_CLVM"]:
diff --git a/src/full_node/full_node.py b/src/full_node/full_node.py
index 9ee4dd4e59eee..b2a14d306dd44 100644
--- a/src/full_node/full_node.py
+++ b/src/full_node/full_node.py
@@ -1283,7 +1283,10 @@ class FullNode:
         # Calculate the cost of transactions
         cost = uint64(0)
         if solution_program:
-            _, _, cost = calculate_cost_of_program(solution_program)
+            _, _, cost = calculate_cost_of_program(
+                solution_program,
+                self.constants.CLVM_COST_RATIO_CONSTANT
+            )
 
         extension_data: bytes32 = bytes32([0] * 32)
 
diff --git a/src/full_node/mempool_manager.py b/src/full_node/mempool_manager.py
index 57c8a2a57096c..92c3eed29c2bd 100644
--- a/src/full_node/mempool_manager.py
+++ b/src/full_node/mempool_manager.py
@@ -122,7 +122,10 @@ class MempoolManager:
         # Calculate the cost and fees
         program = best_solution_program(new_spend)
         # npc contains names of the coins removed, puzzle_hashes and their spend conditions
-        fail_reason, npc_list, cost = calculate_cost_of_program(program)
+        fail_reason, npc_list, cost = calculate_cost_of_program(
+            program,
+            self.constants.CLVM_COST_RATIO_CONSTANT,
+        )
         if fail_reason:
             return None, MempoolInclusionStatus.FAILED, fail_reason
 
diff --git a/src/util/cost_calculator.py b/src/util/cost_calculator.py
index 3570c26cba155..f9f6e73012f0c 100644
--- a/src/util/cost_calculator.py
+++ b/src/util/cost_calculator.py
@@ -1,6 +1,5 @@
 from typing import Tuple, Optional, List
 
-from src.consensus.constants import constants
 from src.consensus.condition_costs import ConditionCost
 from src.types.condition_opcodes import ConditionOpcode
 from src.types.program import Program
@@ -12,6 +11,7 @@ from src.util.mempool_check_conditions import get_name_puzzle_conditions
 
 def calculate_cost_of_program(
     program: Program,
+    clvm_cost_ratio_constant: int,
 ) -> Tuple[Optional[Err], List[NPC], uint64]:
     """
     This function calculates the total cost of either block or a spendbundle
@@ -60,6 +60,6 @@ def calculate_cost_of_program(
     # Add raw size of the program
     total_vbyte_cost += len(bytes(program))
 
-    total_clvm_cost += total_vbyte_cost * constants["CLVM_COST_RATIO_CONSTANT"]
+    total_clvm_cost += total_vbyte_cost * clvm_cost_ratio_constant
 
     return error, npc_list, uint64(total_clvm_cost)
diff --git a/tests/test_cost_calculation.py b/tests/test_cost_calculation.py
index add0fd3bde326..36a9f2273f388 100644
--- a/tests/test_cost_calculation.py
+++ b/tests/test_cost_calculation.py
@@ -40,12 +40,13 @@ class TestCostCalculation:
         assert spend_bundle is not None
         program = best_solution_program(spend_bundle)
 
-        error, npc_list, clvm_cost = calculate_cost_of_program(program)
+        ratio = test_constants["CLVM_COST_RATIO_CONSTANT"]
+
+        error, npc_list, clvm_cost = calculate_cost_of_program(program, ratio)
 
         error, npc_list, cost = get_name_puzzle_conditions(program)
 
         # Create condition + agg_sig_condition + length + cpu_cost
-        ratio = test_constants["CLVM_COST_RATIO_CONSTANT"]
         assert (
             clvm_cost == 200 * ratio + 20 * ratio + len(bytes(program)) * ratio + cost
         )