diff --git a/developer_manual/conf.py b/developer_manual/conf.py
index 9ce75ea691c..944fe05be75 100644
--- a/developer_manual/conf.py
+++ b/developer_manual/conf.py
@@ -179,7 +179,7 @@
 #'pointsize': '10pt',
 
 # Additional stuff for the LaTeX preamble.
-#'preamble': '',
+'preamble': '\\extrafloats\{100\}',
 }
 
 # Grouping the document tree into LaTeX files. List of tuples