diff --git a/libguestfs.spec b/libguestfs.spec
index 7f095d6..e7ffe81 100644
--- a/libguestfs.spec
+++ b/libguestfs.spec
@@ -907,8 +907,7 @@ popd
 # On all known architectures, depending on 'kernel' should
 # mean "we need a kernel".
 pushd $RPM_BUILD_ROOT%{_libdir}/guestfs/supermin.d
-sed 's/^kernel-.*/kernel/' < packages > packages-t
-mv packages-t packages
+sed -i 's/^kernel-.*/kernel/' packages
 popd
 
 # Guestfish colour prompts.