diff --git a/src/dp_learning_ff/utils.py b/src/dp_learning_ff/utils.py
index c412b5a..61648c4 100644
--- a/src/dp_learning_ff/utils.py
+++ b/src/dp_learning_ff/utils.py
@@ -119,8 +119,8 @@ def strictness_comp(
         curr_obj = f(x)
         if (
             strictness_comp(curr_obj, target, strictly)
-            and target - curr_obj < abs_tol
-            and (target - curr_obj) / target < rel_tol
+            and abs(target - curr_obj) < abs_tol
+            and abs((target - curr_obj) / target) < rel_tol
         ):
             break
         if monotonicity_comp(x, target, f_monotonicity):