diff --git a/openstackdocstheme/page_context.py b/openstackdocstheme/page_context.py
index 4e37ecca..7c7d8ab1 100644
--- a/openstackdocstheme/page_context.py
+++ b/openstackdocstheme/page_context.py
@@ -16,11 +16,11 @@ import os.path
 import subprocess
 import time
 
+import sphinx
 from sphinx.util import logging
 
 from . import version
 
-
 LOG = logging.getLogger(__name__)
 
 _timeint = int(os.environ.get('SOURCE_DATE_EPOCH', time.time()))
@@ -80,7 +80,12 @@ def _get_last_updated(app, pagename):
 
     # Strip the prefix from the filename so the git command recognizes
     # the file as part of the current repository.
-    src_file = full_src_file[len(str(app.builder.env.srcdir)) :].lstrip('/')
+    if sphinx.version_info >= (7, 0):
+        src_file = str(full_src_file.relative_to(app.builder.env.srcdir))
+    else:  # Sphinx < 7.0
+        src_file = full_src_file[len(str(app.builder.env.srcdir)) :].lstrip(
+            '/'
+        )
     candidates.append(src_file)
 
     if not os.path.exists(src_file):