diff --git a/supergfxctl.spec b/supergfxctl.spec
index 0367c09..0712130 100644
--- a/supergfxctl.spec
+++ b/supergfxctl.spec
@@ -51,7 +51,7 @@ install -D -m 0644 README.md %{buildroot}%{_datadir}/doc/%{name}/README.md
 
 %post
 %service_add_post supergfxd.service
-if [ -f %{_sysconfdir}/modprobe.d/supergfxd.conf ]
+if [ ! -e %{_sysconfdir}/modprobe.d/supergfxd.conf ]
 then
     systemctl enable supergfxd.service
 fi