diff --git a/doc/doxygen/Doxyfile b/doc/doxygen/Doxyfile
index 1abb83b5b..677098dd8 100644
--- a/doc/doxygen/Doxyfile
+++ b/doc/doxygen/Doxyfile
@@ -15,7 +15,7 @@
 #---------------------------------------------------------------------------
 
 USE_MATHJAX           = YES
-MATHJAX_RELPATH       = http://cdn.mathjax.org/mathjax/latest
+MATHJAX_RELPATH       = https://cdn.mathjax.org/mathjax/latest
 
 # This tag specifies the encoding used for all characters in the config file
 # that follow. The default is UTF-8 which is also the encoding used for all
diff --git a/doc/sphinx/conf.py b/doc/sphinx/conf.py
index 36f794e6a..0d7d3fca1 100644
--- a/doc/sphinx/conf.py
+++ b/doc/sphinx/conf.py
@@ -52,7 +52,7 @@ autodoc_default_flags = ['members','show-inheritance','undoc-members']
 
 autoclass_content = 'both'
 
-mathjax_path = 'http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'
+mathjax_path = 'https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'
 
 doxylink = {
         'ct' : (os.path.abspath('../../build/docs/Cantera.tag'),