diff --git a/sphinx_rtd_theme/layout.html b/sphinx_rtd_theme/layout.html
index 1d7011976..a55564236 100644
--- a/sphinx_rtd_theme/layout.html
+++ b/sphinx_rtd_theme/layout.html
@@ -10,8 +10,8 @@
{%- set sphinx_writer = 'writer-html5' if html5_doctype else 'writer-html4' -%}
{# Build sphinx_version_info tuple from sphinx_version string in pure Jinja #}
-{%- set (_ver_major, _ver_minor, _ver_bugfix) = sphinx_version.split('.') | map('int') -%}
-{%- set sphinx_version_info = (_ver_major, _ver_minor, _ver_bugfix) -%}
+{%- set (_ver_major, _ver_minor) = sphinx_version.split('.')[:2] | map('int') -%}
+{%- set sphinx_version_info = (_ver_major, _ver_minor) -%}