diff --git a/mingw32-winpthreads.spec b/mingw32-winpthreads.spec
index a8347e0..ff1b089 100644
--- a/mingw32-winpthreads.spec
+++ b/mingw32-winpthreads.spec
@@ -59,6 +59,7 @@ Group:          Development/Libraries/C and C++
 Requires:       mingw32-libwinpthread1 = %version
 Provides:       mingw32-unistd-pthread-devel
 Conflicts:      mingw32-headers-dummy-pthread, otherproviders(mingw32-unistd-pthread-devel)
+Obsoletes:      mingw32-headers-dummy-pthread
 
 %description devel
 mingw-w64's implementation of POSIX threads for Windows.
@@ -85,6 +86,9 @@ make %{?_smp_mflags}
 %install
 make DESTDIR=%buildroot install %{?_smp_mflags}
 
+%clean
+:
+
 %files -n mingw32-libwinpthread1
 %defattr(-,root,root)
 %_mingw32_bindir/libwinpthread-1.dll