diff --git a/lib/redmine/field_format.rb b/lib/redmine/field_format.rb
index e74dc20d7..a27311141 100644
--- a/lib/redmine/field_format.rb
+++ b/lib/redmine/field_format.rb
@@ -276,15 +276,15 @@ module Redmine
       # %m1%, %m2%... => capture groups matches of the custom field regexp if defined
       def url_from_pattern(custom_field, value, customized)
         url = custom_field.url_pattern.to_s.dup
-        url.gsub!('%value%') {Addressable::URI.encode value.to_s}
-        url.gsub!('%id%') {Addressable::URI.encode customized.id.to_s}
+        url.gsub!('%value%') {Addressable::URI.encode_component value.to_s}
+        url.gsub!('%id%') {Addressable::URI.encode_component customized.id.to_s}
         url.gsub!('%project_id%') do
-          Addressable::URI.encode(
+          Addressable::URI.encode_component(
             (customized.respond_to?(:project) ? customized.project.try(:id) : nil).to_s
           )
         end
         url.gsub!('%project_identifier%') do
-          Addressable::URI.encode(
+          Addressable::URI.encode_component(
             (customized.respond_to?(:project) ? customized.project.try(:identifier) : nil).to_s
           )
         end
@@ -292,7 +292,7 @@ module Redmine
           url.gsub!(%r{%m(\d+)%}) do
             m = $1.to_i
             if matches ||= value.to_s.match(Regexp.new(custom_field.regexp))
-              Addressable::URI.encode matches[m].to_s
+              Addressable::URI.encode_component matches[m].to_s
             end
           end
         end
diff --git a/test/unit/lib/redmine/field_format/field_format_test.rb b/test/unit/lib/redmine/field_format/field_format_test.rb
index 090405b15..d6620517a 100644
--- a/test/unit/lib/redmine/field_format/field_format_test.rb
+++ b/test/unit/lib/redmine/field_format/field_format_test.rb
@@ -90,6 +90,14 @@ class Redmine::FieldFormatTest < ActionView::TestCase
     assert_equal '<a href="http://foo/foo%20bar" class="external">foo bar</a>', field.format.formatted_custom_value(self, custom_value, true)
   end
 
+  def test_text_field_with_url_pattern_and_value_containing_a_colon_preceded_by_a_space_should_format_as_link
+    field = IssueCustomField.new(:field_format => 'string', :url_pattern => 'http://foo/%value%')
+    custom_value = CustomValue.new(:custom_field => field, :customized => Issue.new, :value => "foo :bar")
+
+    assert_equal "foo :bar", field.format.formatted_custom_value(self, custom_value, false)
+    assert_equal '<a href="http://foo/foo%20:bar" class="external">foo :bar</a>', field.format.formatted_custom_value(self, custom_value, true)
+  end
+
   def test_text_field_with_url_pattern_should_not_encode_url_pattern
     field = IssueCustomField.new(:field_format => 'string', :url_pattern => 'http://foo/bar#anchor')
     custom_value = CustomValue.new(:custom_field => field, :customized => Issue.new, :value => "1")