diff --git a/app/helpers/issues_helper.rb b/app/helpers/issues_helper.rb
index d51c9cb65..05090c7b3 100644
--- a/app/helpers/issues_helper.rb
+++ b/app/helpers/issues_helper.rb
@@ -309,11 +309,11 @@ module IssuesHelper
     when 'relation'
       if detail.value && !detail.old_value
         rel_issue = Issue.visible.find_by_id(detail.value)
-        value = rel_issue.nil? ? "#{l(:label_issue)} #{detail.value}" :
+        value = rel_issue.nil? ? "#{l(:label_issue)} ##{detail.value}" :
                   (no_html ? rel_issue : link_to_issue(rel_issue))
       elsif detail.old_value && !detail.value
         rel_issue = Issue.visible.find_by_id(detail.old_value)
-        old_value = rel_issue.nil? ? "#{l(:label_issue)} #{detail.old_value}" :
+        old_value = rel_issue.nil? ? "#{l(:label_issue)} ##{detail.old_value}" :
                           (no_html ? rel_issue : link_to_issue(rel_issue))
       end
       label = l(detail.prop_key.to_sym)
diff --git a/test/unit/helpers/issues_helper_test.rb b/test/unit/helpers/issues_helper_test.rb
index b49410f54..edf66b732 100644
--- a/test/unit/helpers/issues_helper_test.rb
+++ b/test/unit/helpers/issues_helper_test.rb
@@ -223,8 +223,8 @@ class IssuesHelperTest < ActionView::TestCase
     detail = JournalDetail.new(:property => 'relation',
                                :prop_key => 'label_precedes',
                                :value    => non_existed_issue_number)
-    assert_equal "Precedes Issue #{non_existed_issue_number} added", show_detail(detail, true)
-    assert_equal "<strong>Precedes</strong> <i>Issue #{non_existed_issue_number}</i> added", show_detail(detail, false)
+    assert_equal "Precedes Issue ##{non_existed_issue_number} added", show_detail(detail, true)
+    assert_equal "<strong>Precedes</strong> <i>Issue ##{non_existed_issue_number}</i> added", show_detail(detail, false)
   end
 
   def test_show_detail_relation_added_should_not_disclose_issue_that_is_not_visible
@@ -233,8 +233,8 @@ class IssuesHelperTest < ActionView::TestCase
                                :prop_key => 'label_precedes',
                                :value    => issue.id)
 
-    assert_equal "Precedes Issue #{issue.id} added", show_detail(detail, true)
-    assert_equal "<strong>Precedes</strong> <i>Issue #{issue.id}</i> added", show_detail(detail, false)
+    assert_equal "Precedes Issue ##{issue.id} added", show_detail(detail, true)
+    assert_equal "<strong>Precedes</strong> <i>Issue ##{issue.id}</i> added", show_detail(detail, false)
   end
 
   def test_show_detail_delete_relation
@@ -249,8 +249,8 @@ class IssuesHelperTest < ActionView::TestCase
     detail = JournalDetail.new(:property  => 'relation',
                                :prop_key  => 'label_precedes',
                                :old_value => non_existed_issue_number)
-    assert_equal "Precedes deleted (Issue 9999)", show_detail(detail, true)
-    assert_equal "<strong>Precedes</strong> deleted (<i>Issue 9999</i>)", show_detail(detail, false)
+    assert_equal "Precedes deleted (Issue #9999)", show_detail(detail, true)
+    assert_equal "<strong>Precedes</strong> deleted (<i>Issue #9999</i>)", show_detail(detail, false)
   end
 
   def test_show_detail_relation_deleted_should_not_disclose_issue_that_is_not_visible
@@ -259,7 +259,7 @@ class IssuesHelperTest < ActionView::TestCase
                                :prop_key => 'label_precedes',
                                :old_value    => issue.id)
 
-    assert_equal "Precedes deleted (Issue #{issue.id})", show_detail(detail, true)
-    assert_equal "<strong>Precedes</strong> deleted (<i>Issue #{issue.id}</i>)", show_detail(detail, false)
+    assert_equal "Precedes deleted (Issue ##{issue.id})", show_detail(detail, true)
+    assert_equal "<strong>Precedes</strong> deleted (<i>Issue ##{issue.id}</i>)", show_detail(detail, false)
   end
 end