diff --git a/python-pmw.spec b/python-pmw.spec
index 2fd4c99..b26c2e4 100644
--- a/python-pmw.spec
+++ b/python-pmw.spec
@@ -35,6 +35,7 @@ BuildRequires:  fdupes
 BuildArch:      noarch
 %endif
 %endif
+%{!?python_sitelib: %global python_sitelib %(%{__python} -c "from distutils.sysconfig import get_python_lib; print get_python_lib()")}
 
 %description
 A toolkit for building high-level compound widgets in Python using the Tkinter