diff --git a/lib/galaxy/tools/parameters.py b/lib/galaxy/tools/parameters.py
index 721980e2de9..934a58772cf 100644
--- a/lib/galaxy/tools/parameters.py
+++ b/lib/galaxy/tools/parameters.py
@@ -651,7 +651,7 @@ class DataToolParameter( ToolParameter ):
     >>> from galaxy.util.bunch import Bunch
     >>> hist = History()
     >>> hist.flush()
-    >>> hist.add_dataset( Dataset( id=1, extension='text' ) )
+    >>> hist.add_dataset( Dataset( id=1, extension='txt' ) )
     >>> hist.add_dataset( Dataset( id=2, extension='bed' ) )
     >>> hist.add_dataset( Dataset( id=3, extension='fasta' ) )
     >>> hist.add_dataset( Dataset( id=4, extension='png' ) )
diff --git a/lib/galaxy/web/controllers/root.py b/lib/galaxy/web/controllers/root.py
index a8257d2da58..67e7d089c58 100644
--- a/lib/galaxy/web/controllers/root.py
+++ b/lib/galaxy/web/controllers/root.py
@@ -537,7 +537,7 @@ class Universe( BaseController ):
         return trans.show_message( "<p><h2>Rename history</h2>%s" % change_msg, refresh_frames=['history'] ) 
 
     @web.expose
-    def history_add_to( self, trans, history_id=None, file_data=None, name="Data Added to History",info=None,ext="text",dbkey="?",**kwd ):
+    def history_add_to( self, trans, history_id=None, file_data=None, name="Data Added to History",info=None,ext="txt",dbkey="?",**kwd ):
         """Adds a POSTed file to a History"""
         try:
             history = trans.app.model.History.get( history_id )