diff --git a/python/test/pyLink_TEST.py b/python/test/pyLink_TEST.py
index 7ea7c9341..55b96dc81 100644
--- a/python/test/pyLink_TEST.py
+++ b/python/test/pyLink_TEST.py
@@ -521,7 +521,7 @@ def test_inertial_values_given_with_auto_set_to_true(self):
         root.resolve_auto_inertials(errors, sdfParserConfig)
         self.assertEqual(len(errors), 0)
 
-        self.assertNotEqual(4.0, link.inertial().mass_matrix().mass())
+        self.assertEqual(2.0, link.inertial().mass_matrix().mass())
         self.assertEqual(Pose3d.ZERO, link.inertial().pose())
         self.assertEqual(Vector3d(0.33333, 0.33333, 0.33333),
             link.inertial().mass_matrix().diagonal_moments())
diff --git a/src/Link_TEST.cc b/src/Link_TEST.cc
index b335863c8..74e22b459 100644
--- a/src/Link_TEST.cc
+++ b/src/Link_TEST.cc
@@ -766,7 +766,7 @@ TEST(DOMLink, InertialValuesGivenWithAutoSetToTrue)
   root.ResolveAutoInertials(errors, sdfParserConfig);
   EXPECT_TRUE(errors.empty());
 
-  EXPECT_NE(4.0, link->Inertial().MassMatrix().Mass());
+  EXPECT_EQ(2.0, link->Inertial().MassMatrix().Mass());
   EXPECT_EQ(gz::math::Pose3d::Zero, link->Inertial().Pose());
   EXPECT_EQ(gz::math::Vector3d(0.33333, 0.33333, 0.33333),
     link->Inertial().MassMatrix().DiagonalMoments());