diff --git a/test/unit/lib/redmine/export/pdf_test.rb b/test/unit/lib/redmine/export/pdf_test.rb
index 6118b96c0..98b30cc6d 100644
--- a/test/unit/lib/redmine/export/pdf_test.rb
+++ b/test/unit/lib/redmine/export/pdf_test.rb
@@ -5,12 +5,12 @@
 # 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) any later version.
-# 
+#
 # 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, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
@@ -28,6 +28,7 @@ class PdfTest < ActiveSupport::TestCase
   end
 
   def test_fix_text_encoding_cannot_convert_ja_cp932
+    set_language_if_valid 'ja'
     pdf = Redmine::Export::PDF::IFPDF.new('ja')
     assert pdf
     utf8_txt_1  = "\xe7\x8b\x80\xe6\x85\x8b"