diff --git a/distros/ubuntu1504_cmake/control b/distros/ubuntu1504_cmake/control
index c2098f179..65e11fac9 100644
--- a/distros/ubuntu1504_cmake/control
+++ b/distros/ubuntu1504_cmake/control
@@ -104,7 +104,7 @@ Package: zoneminder-doc
 Section: doc
 Architecture: all
 Multi-Arch: foreign
-Depends: ${misc:Depends}, ${sphinxdoc:Depends}
+Depends: ${misc:Depends}, ${sphinxdoc:Depends}, python-sphinx-rtd-theme | python3-sphinx-rtd-theme
 Suggests: www-browser
 Description: ZoneMinder documentation
  ZoneMinder is intended for use in single or multi-camera video security