diff --git a/test/test_grudge.py b/test/test_grudge.py
index 50cb3d0b2cba0c60e1a8241c900afd113bfc4208..4734a199551abe8bb625e9cd5744dce46610a9cd 100644
--- a/test/test_grudge.py
+++ b/test/test_grudge.py
@@ -142,11 +142,11 @@ def test_mass_mat_trig(ctx_factory, ambient_dim, quad_tag):
 
     num_integral_1 = np.dot(ones_volm, mass_op(queue, f=f_quad).get())
     err_1 = abs(num_integral_1 - true_integral)
-    assert err_1 < 5.0e-10, err_1
+    assert err_1 < 1e-9, err_1
 
     num_integral_2 = np.dot(f_volm, mass_op(queue, f=ones_quad).get())
     err_2 = abs(num_integral_2 - true_integral)
-    assert err_2 < 5.0e-10, err_2
+    assert err_2 < 1.0e-9, err_2
 
     if quad_tag is sym.QTAG_NONE:
         # NOTE: `integral` always makes a square mass matrix and