diff --git a/tests/utils/context.py b/tests/utils/context.py
index cbf78ad..9d90753 100644
--- a/tests/utils/context.py
+++ b/tests/utils/context.py
@@ -333,7 +333,7 @@ def compare_out_pngs(self, out_file='diff.pdf'):
         for png in pngs:
             name = os.path.basename(png)
             diff = os.path.splitext(name)[0]+'-diff.png'
-            self.compare_image(name, name, diff=diff)
+            self.compare_image(name, name, diff=diff, fuzz='35%')
 
     def compare_pdf(self, gen, reference=None, diff='diff-{}.png'):
         """ For multi-page PDFs """