diff --git a/python-sphinxcontrib-websupport.spec b/python-sphinxcontrib-websupport.spec
index 42593b2..017a39a 100644
--- a/python-sphinxcontrib-websupport.spec
+++ b/python-sphinxcontrib-websupport.spec
@@ -24,11 +24,13 @@ BuildRequires:  python3-mock
 BuildRequires:  python3-pytest
 BuildRequires:  python3-six
 BuildRequires:  python3-sphinx
+BuildRequires:  python3-sphinxcontrib-serializinghtml >= 1.1.3
 BuildRequires:  python3-sqlalchemy
 BuildRequires:  python3-whoosh
 Requires:       python3-jinja2
 Requires:       python3-six
 Requires:       python3-sphinx
+Requires:       python3-sphinxcontrib-serializinghtml >= 1.1.3
 Recommends:     python3-sqlalchemy
 Recommends:     python3-whoosh
 
@@ -41,10 +43,6 @@ documentation into your Web application.
 # Remove bundled egg-info
 rm -rf %{pypi_name}.egg-info
 
-# This "magical" import somehow doesn't work here
-# XXX investigate
-sed -i 's/from sphinx\.builders\.html import /from sphinxcontrib.serializinghtml import /' sphinxcontrib/websupport/builder.py
-
 %build
 %py3_build