diff --git a/lib/releaseme/xzarchive.rb b/lib/releaseme/xzarchive.rb
index b2aed4e..30ca0cc 100644
--- a/lib/releaseme/xzarchive.rb
+++ b/lib/releaseme/xzarchive.rb
@@ -1,94 +1,94 @@
 #--
 # Copyright (C) 2007-2017 Harald Sitter <sitter@kde.org>
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License as
 # published by the Free Software Foundation; either version 2 of
 # the License or (at your option) version 3 or any later version
 # accepted by the membership of KDE e.V. (or its successor approved
 # by the membership of KDE e.V.), which shall act as a proxy
 # defined in Section 14 of version 3 of the license.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #++
 
 require_relative 'assert_case_insensitive'
 
 module ReleaseMe
   ##
   # Tar-XZ Archiving Class.
   # This class archives @directory into an tar file and compresses it using xz.
   # Compression strength is set via @level.
   class XzArchive
     # The directory to archive
     attr_accessor :directory
 
     # XZ compression level (must be between 1 and 9 - other values will not
     # result in an archive file)
     attr_accessor :level
 
     # XZ compressed tarball file name (e.g. foobar-1.tar.xz)
     # This is nil unless create() finished successfully.
     attr_reader :filename
 
     # @return String absolute path of archive file
     attr_reader :path
 
     LEVEL_RANGE = 0..9
 
     # Creates new XzArchive. @directory must be assigned separately.
     def initialize
       @directory = nil
       @level = 9
       @filename = nil
       @path = nil
     end
 
     ##
     # call-seq:
     #  archive.create() -> true or false
     #
     # Create the archive. Creates an archive based on the directory attribute.
     # Results in @directory.tar.xz in the present working directory.
     #--
     # FIXME: need routine to run and log a) command b) results c) outputs
     #++
     def create
       xz = "#{directory}.tar.xz"
       return false unless valid?
       FileUtils.rm_rf(xz)
       # Note that system returns bool but only captures stdout.
       compress(directory, xz) || raise
       return true
     rescue RuntimeError
       FileUtils.rm_rf(xz)
       return false
     end
 
     private
 
     def valid?
       File.exist?(@directory) && LEVEL_RANGE.include?(@level) && asserts
     end
 
     def asserts
       AssertCaseInsensitive.assert(@directory)
       true # Included in && chain.
     end
 
     def compress(dir, xz)
       # Tar and compress in one go. tar supports -J for quite a while now.
       system({ 'XZ_OPT' => "-#{level}" },
              'tar', 'cfJ', xz, dir,
-             %i[out err] => File::NULL)
+             %i[out] => File::NULL) || raise
       @filename = xz
       @path = File.realpath(xz)
     end
   end
 end