diff --git a/test/integration/clitest/test_render.py b/test/integration/clitest/test_render.py
index e9ba68a..403351e 100644
--- a/test/integration/clitest/test_render.py
+++ b/test/integration/clitest/test_render.py
@@ -418,7 +418,9 @@ def test_set_inactive(self, tmpdir):
 
     def test_thumb_nordef(self):
         self.create_image()
-        self.delete_args += ["Image/Thumbnail:" + self.idonly, "Image/RenderingDef:" + self.idonly]
+        self.delete_args += [
+            "Image/Thumbnail:" + self.idonly,
+            "Image/RenderingDef:" + self.idonly]
         self.cli.invoke(self.delete_args, strict=True)
         self.args += ["test", "--thumb", self.idonly]
         self.cli.invoke(self.args, strict=True)