diff --git a/lib/releaseme/tmpdir.rb b/lib/releaseme/tmpdir.rb
index 96ef65a..58ca6ae 100644
--- a/lib/releaseme/tmpdir.rb
+++ b/lib/releaseme/tmpdir.rb
@@ -1,39 +1,39 @@
 # Copyright (C) 2018 Harald Sitter
 #
 # 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 'tmpdir'
 
 # ReleaseMe release tool library.
 module ReleaseMe
   module_function
 
   # Overlay for Dir.mktmpdir to ensure no invalid characters are used for
   # Windows. This is asserted on all platforms for practical reasons... invalid
   # prefixes/suffixes should not be constructed regardless of the platform.
   def mktmpdir(prefix_suffix, *args, &block)
     if prefix_suffix.is_a?(String)
       prefix_suffix = prefix_suffix.gsub(/[^0-9A-Za-z.\-_]/, '_')
     elsif prefix_suffix.is_a?(Array)
       prefix_suffix = prefix_suffix.collect do |x|
         x.gsub(/[^0-9A-Za-z.\-_]/, '_')
       end
     end
     ENV['SANITIZED_PREFIX_SUFFIX'] = '1' # Used in testme. Resets automatically.
-    Dir.mktmpdir(*prefix_suffix, *args, &block)
+    Dir.mktmpdir(prefix_suffix, *args, &block)
   end
 end