diff --git a/tests/test_util.py b/tests/test_util.py
index f281fd111..6a12b3d14 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -847,7 +847,8 @@ def test_highlight_json():
 
     assert html == """<div><h2>Example</h2>
 <div class="highlight"><pre><span></span><span class="p">{</span>
-<span class="w">    </span><span class="nt">"key"</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span>
+<span class="w">    </span><span class="nt">"key"</span><span class="p">:</span><span class="w"> </span>\
+<span class="mi">1</span>
 <span class="p">}</span>
 </pre></div>
 </div>"""