diff --git a/doc/requirements.txt b/doc/requirements.txt
index e179cd5a..875f9897 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,5 +1,4 @@
 openstackdocstheme>=2.2.1 # Apache-2.0
 reno>=3.1.0 # Apache-2.0
 sphinx>=2.0.0 # BSD
-sphinxcontrib-httpdomain>=1.3.0  # BSD
 python-openstackclient>=3.12.0 # Apache-2.0