diff --git a/app/helpers/post_versions_helper.rb b/app/helpers/post_versions_helper.rb
index e01d36824..062deebf4 100644
--- a/app/helpers/post_versions_helper.rb
+++ b/app/helpers/post_versions_helper.rb
@@ -6,10 +6,12 @@ module PostVersionsHelper
     diff[:added_tags].each do |tag|
       prefix = diff[:obsolete_added_tags].include?(tag) ? '+<ins class="obsolete">' : '<ins>+'
       html << prefix + link_to(wordbreakify(tag), posts_path(:tags => tag)) + '</ins>'
+      html << " "
     end
     diff[:removed_tags].each do |tag|
       prefix = diff[:obsolete_removed_tags].include?(tag) ? '-<del class="obsolete">' : '<del>-'
       html << prefix + link_to(wordbreakify(tag), posts_path(:tags => tag)) + '</del>'
+      html << " "
     end
     diff[:unchanged_tags].each do |tag|
       html << '<span>' + link_to(wordbreakify(tag), posts_path(:tags => tag)) + '</span>'