diff --git a/python39.spec b/python39.spec
index 18e9793..3400257 100644
--- a/python39.spec
+++ b/python39.spec
@@ -136,6 +136,7 @@ Patch32:        sphinx-update-removed-function.patch
 # PATCH-FIX-SLE no-skipif-doctests.patch jsc#SLE-13738 mcepl@suse.com
 # SLE-15 version of Sphinx doesn't know about skipif directive in doctests.
 Patch33:        no-skipif-doctests.patch
+BuildRequires:  autoconf-archive
 BuildRequires:  automake
 BuildRequires:  fdupes
 BuildRequires:  gmp-devel