diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 2c093a26f..e5b75c4cf 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -384,7 +384,7 @@ module ApplicationHelper
     if @project
       link_to(text, {:controller => 'activities', :action => 'index', :id => @project, :from => User.current.time_to_date(time)}, :title => format_time(time))
     else
-      content_tag('acronym', text, :title => format_time(time))
+      content_tag('abbr', text, :title => format_time(time))
     end
   end
 
diff --git a/lib/redcloth3.rb b/lib/redcloth3.rb
index cb2293443..7e9097ee3 100644
--- a/lib/redcloth3.rb
+++ b/lib/redcloth3.rb
@@ -129,7 +129,7 @@
 #
 # Will become:
 #
-#  <acronym title="American Civil Liberties Union">ACLU</acronym>
+#  <abbr title="American Civil Liberties Union">ACLU</abbr>
 #
 # == Adding Tables
 #
@@ -457,7 +457,7 @@ class RedCloth3 < String
         #    text.gsub! re, resub
         #end
         text.gsub!(/\b([A-Z][A-Z0-9]{1,})\b(?:[(]([^)]*)[)])/) do |m|
-          "<acronym title=\"#{htmlesc $2}\">#{$1}</acronym>"
+          "<abbr title=\"#{htmlesc $2}\">#{$1}</abbr>"
         end
     end
 
diff --git a/public/stylesheets/application.css b/public/stylesheets/application.css
index c145abd5c..2823229f2 100644
--- a/public/stylesheets/application.css
+++ b/public/stylesheets/application.css
@@ -315,7 +315,7 @@ legend {color: #484848;}
 hr { width: 100%; height: 1px; background: #ccc; border: 0;}
 blockquote { font-style: italic; border-left: 3px solid #e0e0e0; padding-left: 0.6em; margin-left: 2.4em;}
 blockquote blockquote { margin-left: 0;}
-acronym  { border-bottom: 1px dotted; cursor: help; }
+abbr  { border-bottom: 1px dotted; cursor: help; }
 textarea.wiki-edit {width:99%; resize:vertical;}
 li p {margin-top: 0;}
 div.issue {background:#ffffdd; padding:6px; margin-bottom:6px;border: 1px solid #d7d7d7;}
diff --git a/test/unit/lib/redmine/wiki_formatting/textile_formatter_test.rb b/test/unit/lib/redmine/wiki_formatting/textile_formatter_test.rb
index 324cea1e6..33b5f0985 100644
--- a/test/unit/lib/redmine/wiki_formatting/textile_formatter_test.rb
+++ b/test/unit/lib/redmine/wiki_formatting/textile_formatter_test.rb
@@ -159,11 +159,11 @@ EXPECTED
     )
   end
 
-  def test_acronyms
+  def test_abbreviations
     assert_html_output(
-      'this is an acronym: GPL(General Public License)' => 'this is an acronym: <acronym title="General Public License">GPL</acronym>',
-      '2 letters JP(Jean-Philippe) acronym' => '2 letters <acronym title="Jean-Philippe">JP</acronym> acronym',
-      'GPL(This is a double-quoted "title")' => '<acronym title="This is a double-quoted &quot;title&quot;">GPL</acronym>'
+      'this is an abbreviation: GPL(General Public License)' => 'this is an abbreviation: <abbr title="General Public License">GPL</abbr>',
+      '2 letters JP(Jean-Philippe) abbreviation' => '2 letters <abbr title="Jean-Philippe">JP</abbr> abbreviation',
+      'GPL(This is a double-quoted "title")' => '<abbr title="This is a double-quoted &quot;title&quot;">GPL</abbr>'
     )
   end