diff --git a/uplc/cost_model.py b/uplc/cost_model.py
index ec11aed..7064133 100644
--- a/uplc/cost_model.py
+++ b/uplc/cost_model.py
@@ -267,7 +267,7 @@ class ConstAboveDiagonal(CostingFun):
 
     def cost(self, *memories: int, values=()) -> int:
         x, y = memories[0], memories[1]
-        if x > y:
+        if x < y:
             return self.model_above_diagonal.cost(x, y)
         return self.model_below_equal_diagonal.cost(x, y)
 
diff --git a/uplc/cost_model_files/base/builtinCostModel.json b/uplc/cost_model_files/base/builtinCostModel.json
index 40ea0cc..5bc1fc2 100644
--- a/uplc/cost_model_files/base/builtinCostModel.json
+++ b/uplc/cost_model_files/base/builtinCostModel.json
@@ -724,7 +724,7 @@
                     "type": "quadratic_in_x_and_y"
                 }
             },
-            "type": "const_below_diagonal"
+            "type": "const_above_diagonal"
         },
         "memory": {
             "arguments": {