diff --git a/gnome-system-monitor.spec b/gnome-system-monitor.spec
index c4b7932..8603821 100644
--- a/gnome-system-monitor.spec
+++ b/gnome-system-monitor.spec
@@ -66,7 +66,7 @@ such as CPU and memory.
 %patch1 -p1 -b .session
 
 %build
-autoreconf
+autoreconf -i -f
 %configure --enable-selinux --disable-scrollkeeper --enable-polkit
 # dunno why the deps are not picked up correctly here
 make -C src gnome-system-monitor-mechanism-glue.h gnome-system-monitor-mechanism-client-glue.h