diff --git a/tests/test_moffat.py b/tests/test_moffat.py
index 78d2f0db60..97e8d218e6 100644
--- a/tests/test_moffat.py
+++ b/tests/test_moffat.py
@@ -24,8 +24,9 @@
 from galsim_test_helpers import *
 
 path, filename = os.path.split(__file__)
-imgdir = os.path.join(path, "SBProfile_comparison_images") # Directory containing the reference
-                                                           # images.
+# Directory containing the reference images.
+imgdir = os.path.join(path, "SBProfile_comparison_images")
+
 
 @timer
 def test_moffat():
@@ -198,7 +199,11 @@ def test_moffat_maxk():
             rtol = 1.e-7 if psf.trunc == 0 else 3.e-3
             fk = psf.kValue(psf.maxk,0).real/psf.flux
             print(f'{psf.beta} \t {int(psf.trunc)} \t {thresh:.1e} \t {fk:.3e}')
-            np.testing.assert_allclose(abs(psf.kValue(psf.maxk,0).real)/psf.flux, thresh, rtol=rtol)
+            if hasattr(galsim, "_galsim"):
+                rtol_fac = 10.0
+            else:
+                rtol_fac = 1.0
+            np.testing.assert_allclose(abs(psf.kValue(psf.maxk,0).real)/psf.flux, thresh, rtol=rtol * rtol_fac)
 
 
 @timer