diff --git a/config/nimdoc.cfg b/config/nimdoc.cfg
index d2cfc95401..fdc3d2ba01 100644
--- a/config/nimdoc.cfg
+++ b/config/nimdoc.cfg
@@ -117,7 +117,7 @@ $moduledesc
 $content
 """
 
-doc.listing_start = "<pre class = \"listing\">"
+doc.listing_start = "<pre class=\"listing\">"
 doc.listing_end = "</pre>"
 
 # * $analytics: Google analytics location, includes <script> tags