diff --git a/python-Logbook.changes b/python-Logbook.changes
index d78db18..764eb79 100644
--- a/python-Logbook.changes
+++ b/python-Logbook.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Sat Sep 14 15:30:16 UTC 2019 - John Vandenberg <jayvdb@gmail.com>
+
+- Use python_expand in %build to allow building only a single flavour
+
 -------------------------------------------------------------------
 Tue Mar  5 16:39:48 UTC 2019 - Tomáš Chvátal <tchvatal@suse.com>
 
diff --git a/python-Logbook.spec b/python-Logbook.spec
index bf8dfd2..ae0f7b3 100644
--- a/python-Logbook.spec
+++ b/python-Logbook.spec
@@ -60,11 +60,10 @@ sed -i 's/\r$//' LICENSE
 
 %build
 export CFLAGS="%{optflags} -fno-strict-aliasing"
-cython-%{python2_version} logbook/_speedups.pyx
-%python2_build
+%{python_expand cython-%{$python_version} logbook/_speedups.pyx
+%{$python_build}
 rm logbook/_speedups.c
-cython-%{python3_version} logbook/_speedups.pyx
-%python3_build
+}
 
 %install
 %python_install