diff --git a/lib/redmine/export/pdf.rb b/lib/redmine/export/pdf.rb
index c8189367b..85beb8bdb 100644
--- a/lib/redmine/export/pdf.rb
+++ b/lib/redmine/export/pdf.rb
@@ -52,6 +52,7 @@ module Redmine
         end
 
         def SetFont(family, style='', size=0, fontfile='')
+          style = +style
           # FreeSerif Bold Thai font has problem.
           style.delete!('B') if family.to_s.casecmp('freeserif') == 0
           # DejaVuSans Italic Arabic and Persian font has problem.
diff --git a/test/functional/issues_controller_test.rb b/test/functional/issues_controller_test.rb
index 4d0cb4ef1..cf2a81931 100644
--- a/test/functional/issues_controller_test.rb
+++ b/test/functional/issues_controller_test.rb
@@ -1074,7 +1074,7 @@ class IssuesControllerTest < Redmine::ControllerTest
   end
 
   def test_index_pdf
-    ["en", "zh", "zh-TW", "ja", "ko"].each do |lang|
+    ["en", "zh", "zh-TW", "ja", "ko", "ar"].each do |lang|
       with_settings :default_language => lang do
         get :index
         assert_response :success
@@ -2674,7 +2674,7 @@ class IssuesControllerTest < Redmine::ControllerTest
 
   def test_export_to_pdf_with_utf8_u_fffd
     issue = Issue.generate!(:subject => "�")
-    ["en", "zh", "zh-TW", "ja", "ko"].each do |lang|
+    ["en", "zh", "zh-TW", "ja", "ko", "ar"].each do |lang|
       with_settings :default_language => lang do
         get(
           :show,