diff --git a/cdrdao.spec b/cdrdao.spec
index a124815..31d8452 100644
--- a/cdrdao.spec
+++ b/cdrdao.spec
@@ -1,7 +1,7 @@
 Summary:   Writes audio CD-Rs in disk-at-once (DAO) mode
 Name:      cdrdao
 Version:   1.2.3
-Release:   10%{?dist}
+Release:   11%{?dist}
 License:   GPLv2+
 Group:     Applications/Multimedia
 URL:       http://cdrdao.sourceforge.net/
@@ -12,6 +12,9 @@ BuildRequires:  libsigc++20-devel
 BuildRequires:  libvorbis-devel >= 1.0
 BuildRequires:  libao-devel
 
+# We have removed gcdmaster sub-package in 1.2.3-10
+Obsoletes: gcdmaster < 1.2.3-10
+
 # Only exclude s390
 ExcludeArch: s390 s390x
 
@@ -63,6 +66,9 @@ rm -rf $RPM_BUILD_ROOT
 
 
 %changelog
+* Wed Aug 10 2011 Honza Horak <hhorak@redhat.com> - 1.2.3-11
+- obsolete gcdmaster
+
 * Mon Aug 08 2011 Honza Horak <hhorak@redhat.com> - 1.2.3-10
 - removing a sub-package gcdmaster (xdao) due to missing dependencies 
   on libgnomeuimm26