diff --git a/tests/test_plot/test_pdf.py b/tests/test_plot/test_pdf.py
index edecb28b..69069601 100644
--- a/tests/test_plot/test_pdf.py
+++ b/tests/test_plot/test_pdf.py
@@ -26,7 +26,7 @@ def test_pdf_refill_1(test_dir):
     ctx.run()
     b_cu = ctx.get_gerber_filename('B_Cu', '.pdf')
     ctx.expect_out_file(b_cu)
-    ctx.compare_image(b_cu)
+    ctx.compare_image(b_cu, tol=DIFF_TOL)
     ctx.clean_up()