diff --git a/app/views/wiki/diff.rhtml b/app/views/wiki/diff.rhtml
index 11afc593..a1006dce 100644
--- a/app/views/wiki/diff.rhtml
+++ b/app/views/wiki/diff.rhtml
@@ -13,5 +13,5 @@
 </p>
 
 <div class="text-diff">
-<%= @diff.to_html %>
+<%= simple_format_without_paragraph @diff.to_html %>
 </div>
diff --git a/lib/redmine/helpers/diff.rb b/lib/redmine/helpers/diff.rb
index 24deb3d6..b634d5f1 100644
--- a/lib/redmine/helpers/diff.rb
+++ b/lib/redmine/helpers/diff.rb
@@ -65,7 +65,7 @@ module Redmine
             words_del = 0
           end
         end
-        simple_format(words.join(' '))
+        words.join(' ')
       end
     end
   end