diff --git a/Documentation/conf.py b/Documentation/conf.py
index 9e941be..f9054ab 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -345,7 +345,7 @@
     latex_elements['preamble']  += '\\usepackage[margin=0.5in, top=1in, bottom=1in]{geometry}'
 elif major == 1 and (minor > 5 or (minor == 5 and patch >= 3)):
     latex_elements['sphinxsetup'] = 'hmargin=0.5in, vmargin=1in'
-
+    latex_elements['preamble']  += '\\fvset{fontsize=auto}\n'
 
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title,