diff --git a/test/rendering/fixtures/custom-block-void/output.html b/test/rendering/fixtures/custom-block-void/output.html
index 5a81ebf40..9ceca0f7e 100644
--- a/test/rendering/fixtures/custom-block-void/output.html
+++ b/test/rendering/fixtures/custom-block-void/output.html
@@ -1,6 +1,6 @@
 
 <div contenteditable="true">
-  <div contenteditable="false">
+  <div contenteditable="false" data-void="true">
     <div contenteditable="true" style="position:relative;">
       <span style="position:absolute;top:0px;left:-9999px;text-indent:-9999px;">
         <span>