diff --git a/hkl/tests/test_diffract.py b/hkl/tests/test_diffract.py
index c689b071..a410e54b 100644
--- a/hkl/tests/test_diffract.py
+++ b/hkl/tests/test_diffract.py
@@ -169,7 +169,7 @@ def test_forward_solutions_table(fourc):
     def check_limits_and_value(axis, value, tol=1e-5):
         assert min(fourc.calc[axis].limits) <= value
         assert max(fourc.calc[axis].limits) >= value
-        assert pytest.approx(getattr(sol, axis), 1e-5) == value
+        assert pytest.approx(getattr(sol, axis), abs=1e-5) == value
 
     check_limits_and_value("omega", -30, 0.1)
     check_limits_and_value("chi", 0, 0.1)
@@ -314,10 +314,10 @@ def test_apply_constraints(fourc):
     )
     # fmt: on
     sol = fourc.forward(1, 0, 0)
-    assert pytest.approx(sol.omega, 1e-5) == 30
-    assert pytest.approx(sol.chi, 1e-5) == 0
-    assert pytest.approx(sol.phi, 1e-5) == 90
-    assert pytest.approx(sol.tth, 1e-5) == 60
+    assert pytest.approx(sol.omega, abs=1e-5) == 30
+    assert pytest.approx(sol.chi, abs=1e-5) == 0
+    assert pytest.approx(sol.phi, abs=1e-5) == 90
+    assert pytest.approx(sol.tth, abs=1e-5) == 60
 
 
 def test_specify_engine():