diff --git a/user_manual/conf.py b/user_manual/conf.py
index d3cc349b2..4901e80c4 100644
--- a/user_manual/conf.py
+++ b/user_manual/conf.py
@@ -183,7 +183,10 @@ latex_elements = {
 #'pointsize': '10pt',
 
 # Additional stuff for the LaTeX preamble.
-#'preamble': '',
+'preamble': '\usepackage{epstopdf}\
+\
+\epstopdfDeclareGraphicsRule{.gif}{png}{.png}{convert gif:#1 png:\OutputFile}\
+\AppendGraphicsExtensions{.gif}',
 }
 
 # Grouping the document tree into LaTeX files. List of tuples