diff --git a/gnome-session-interface.patch b/gnome-session-interface.patch
new file mode 100644
index 0000000..1bac5d8
--- /dev/null
+++ b/gnome-session-interface.patch
@@ -0,0 +1,12 @@
+diff -up gnome-session-3.3.5/gnome-session/gsm-system.c.interface gnome-session-3.3.5/gnome-session/gsm-system.c
+--- gnome-session-3.3.5/gnome-session/gsm-system.c.interface	2012-02-09 23:35:03.634312123 -0500
++++ gnome-session-3.3.5/gnome-session/gsm-system.c	2012-02-09 23:35:12.438311807 -0500
+@@ -34,7 +34,7 @@ enum {
+ 
+ static guint signals[LAST_SIGNAL] = { 0 };
+ 
+-G_DEFINE_INTERFACE (GsmSystem, gsm_system, G_TYPE_INTERFACE);
++G_DEFINE_INTERFACE (GsmSystem, gsm_system, G_TYPE_OBJECT)
+ 
+ static void
+ gsm_system_default_init (GsmSystemInterface *iface)
diff --git a/gnome-session.spec b/gnome-session.spec
index cbfb27e..1c07b42 100644
--- a/gnome-session.spec
+++ b/gnome-session.spec
@@ -3,7 +3,7 @@
 Summary: GNOME session manager
 Name: gnome-session
 Version: 3.3.5
-Release: 1%{?dist}
+Release: 2%{?dist}
 URL: http://www.gnome.org
 #VCS: git:git://git.gnome.org/gnome-session
 Source0: http://download.gnome.org/sources/gnome-session/3.3/%{name}-%{version}.tar.xz
@@ -12,6 +12,9 @@ Source2: gnome.desktop
 
 Patch0: gnome-session-3.3.1-llvmpipe.patch
 
+# upstream fix
+Patch1: gnome-session-interface.patch
+
 License: GPLv2+
 Group: User Interface/Desktops
 
@@ -79,6 +82,7 @@ Desktop file to add GNOME to display manager session menu.
 %prep
 %setup -q
 %patch0 -p1 -b .llvmpipe
+%patch1 -p1 -b .interface
 
 echo "ACLOCAL_AMFLAGS = -I m4" >> Makefile.am
 
@@ -154,6 +158,9 @@ glib-compile-schemas %{_datadir}/glib-2.0/schemas || :
 %{_datadir}/glib-2.0/schemas/org.gnome.SessionManager.gschema.xml
 
 %changelog
+* Thu Feb  9 2012 Matthias Clasen <mclasen@redhat.com> - 3.3.5-2
+- Fix a bug in the new system interface registration
+
 * Tue Feb  7 2012 Matthias Clasen <mclasen@redhat.com> - 3.3.5-1
 - Update to 3.3.5
 - Use systemd for session tracking