diff --git a/tests/unit_tests/config/test_transfer_functions.py b/tests/unit_tests/config/test_transfer_functions.py
index 23c0acf0108..e2735e3f6f9 100644
--- a/tests/unit_tests/config/test_transfer_functions.py
+++ b/tests/unit_tests/config/test_transfer_functions.py
@@ -43,15 +43,15 @@ def test_that_truncated_normal_is_monotonic(x1, x2, arg):
     result1 = TransferFunction.trans_truncated_normal(x1, arg)
     result2 = TransferFunction.trans_truncated_normal(x2, arg)
 
-    if x1 < x2:
+    if np.isclose(x1, x2):
+        assert np.isclose(result1, result2)
+    elif x1 < x2:
         # Results should be different unless clamped
         assert (
             result1 < result2
             or (result1 == arg[2] and result2 == arg[2])
             or (result1 == arg[3] and result2 == arg[3])
         )
-    elif x1 == x2:
-        assert result1 == result2
 
 
 @given(valid_params())