diff --git a/0001-test-fix-OBS-build.patch b/0001-test-fix-OBS-build.patch
new file mode 100644
index 0000000..8e9f8e3
--- /dev/null
+++ b/0001-test-fix-OBS-build.patch
@@ -0,0 +1,27 @@
+From d341995f6c3bf19be3bf7038e82d6cd6ff868a5c Mon Sep 17 00:00:00 2001
+From: Martin Vidner <martin@vidner.net>
+Date: Mon, 29 Apr 2013 23:23:32 +0200
+Subject: [PATCH] test: fix OBS build
+
+If I leave the port and family unspecified for the testing bus
+then it starts to work in the openSUSE Build Service. I don't know why.
+---
+ test/dbus-limited-session.conf | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/test/dbus-limited-session.conf b/test/dbus-limited-session.conf
+index 9f1cf02..3ade98b 100644
+--- a/test/dbus-limited-session.conf
++++ b/test/dbus-limited-session.conf
+@@ -8,7 +8,7 @@
+   <type>session</type>
+ 
+   <listen>unix:tmpdir=/tmp</listen>
+-  <listen>tcp:host=127.0.0.1,port=0,family=ipv4</listen>
++  <listen>tcp:host=127.0.0.1</listen>
+ 
+   <standard_session_servicedirs />
+ 
+-- 
+1.8.1.4
+
diff --git a/rubygem-ruby-dbus.changes b/rubygem-ruby-dbus.changes
index 4785627..b02940f 100644
--- a/rubygem-ruby-dbus.changes
+++ b/rubygem-ruby-dbus.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Apr 29 21:31:03 UTC 2013 - mvidner@suse.cz
+
+- fixed build: unspecify port and address family
+
 -------------------------------------------------------------------
 Tue Apr 23 15:25:17 UTC 2013 - mvidner@suse.cz
 
diff --git a/rubygem-ruby-dbus.spec b/rubygem-ruby-dbus.spec
index edb6553..9aaf810 100644
--- a/rubygem-ruby-dbus.spec
+++ b/rubygem-ruby-dbus.spec
@@ -41,6 +41,7 @@ BuildRequires:  ruby-devel >= 1.8.7
 #
 Url:            https://trac.luon.net/ruby-dbus
 Source:         %{mod_full_name}.gem
+Source1:        0001-test-fix-OBS-build.patch
 #
 Summary:        Ruby module for interaction with D-Bus
 %description
@@ -62,9 +63,13 @@ Requires:       %{name} = %{version}
 Test::Unit or RSpec files, useful for developers.
 
 %prep
+%gem_unpack
+patch -p1 < %{S:1}
+%gem_build
+
 %build
 %install
-%gem_install %{S:0}
+%gem_install -f
 
 %check
 cd %{buildroot}/%{_libdir}/ruby/gems/%{rb_ver}/gems/%{mod_name}-%{version}/test