diff --git a/linstor-client.spec b/linstor-client.spec
index 4af690c..67e74b4 100644
--- a/linstor-client.spec
+++ b/linstor-client.spec
@@ -24,7 +24,7 @@ User space client to ease DRBD9 resource management.
 %{python} setup.py build
 
 %install
-%{_python} setup.py install --root=%{buildroot} --prefix=%{_prefix} --debug
+%{python} setup.py install --single-version-externally-managed -O1 --root=$RPM_BUILD_ROOT
 
 %clean
 rm -rf $RPM_BUILD_ROOT