diff --git a/tests/test_geophires_utils.py b/tests/test_geophires_utils.py
index 4b3c2318..dc5fd839 100644
--- a/tests/test_geophires_utils.py
+++ b/tests/test_geophires_utils.py
@@ -320,7 +320,7 @@ def test_valid_input_midpoint_range(self):
 
     def test_valid_input_exact_match(self):
         result = heat_capacity_water_J_per_kg_per_K(25)
-        assert result == 4181.599569862515
+        self.assertAlmostEqual(4181.599569862515, result, places=3)
 
     def test_invalid_input_less_than_minimum(self):
         with self.assertRaises(ValueError):