diff --git a/Doc/tools/sphinxext/pyspecific.py b/Doc/tools/sphinxext/pyspecific.py
index 3e80e12..d1b492a 100644
--- a/Doc/tools/sphinxext/pyspecific.py
+++ b/Doc/tools/sphinxext/pyspecific.py
@@ -10,7 +10,7 @@
 """
 
 ISSUE_URI = 'http://bugs.python.org/issue%s'
-SOURCE_URI = 'http://hg.python.org/cpython/file/default/%s'
+SOURCE_URI = 'https://hg.python.org/cpython/file/default/%s'
 
 from docutils import nodes, utils