diff --git a/config/locales/bs.yml b/config/locales/bs.yml
index 9f9590ea1..51cbd6040 100644
--- a/config/locales/bs.yml
+++ b/config/locales/bs.yml
@@ -80,9 +80,8 @@ bs:
       format:
         unit: 'KM'
         format: '%u %n'
-        separator:
-        delimiter:
-        precision:
+        negative_format: '%u -%n'
+        delimiter: ''
     percentage:
       format:
         delimiter: ""
diff --git a/config/locales/de.yml b/config/locales/de.yml
index be60c3a2b..24ad191ae 100644
--- a/config/locales/de.yml
+++ b/config/locales/de.yml
@@ -84,9 +84,7 @@ de:
       format:
         unit: '€'
         format: '%n %u'
-        separator:
-        delimiter:
-        precision:
+        delimiter: ''
     percentage:
       format:
         delimiter: ""
diff --git a/test/unit/lib/redmine/i18n_test.rb b/test/unit/lib/redmine/i18n_test.rb
index d234ddf3c..046ae2336 100644
--- a/test/unit/lib/redmine/i18n_test.rb
+++ b/test/unit/lib/redmine/i18n_test.rb
@@ -171,6 +171,24 @@ class Redmine::I18nTest < ActiveSupport::TestCase
     assert_equal 'j', day_letter(4)
   end
 
+  def test_number_to_currency_for_each_language
+    valid_languages.each do |lang|
+      set_language_if_valid lang
+      assert_nothing_raised "#{lang} failure" do
+        number_to_currency(-1000.2)
+      end
+    end
+  end
+
+  def test_number_to_currency_default
+    set_language_if_valid 'bs'
+    assert_equal "KM -1000,20", number_to_currency(-1000.2)
+    set_language_if_valid 'de'
+    euro_sign = "\xe2\x82\xac"
+    euro_sign.force_encoding('UTF-8') if euro_sign.respond_to?(:force_encoding)
+    assert_equal "-1000,20 #{euro_sign}", number_to_currency(-1000.2)
+  end
+
   def test_valid_languages
     assert valid_languages.is_a?(Array)
     assert valid_languages.first.is_a?(Symbol)