1 files changed, 2 insertions, 2 deletions
diff --git a/lib/rexml/source.rb b/lib/rexml/source.rb
index ada876cde5..bc99c0ed6a 100644
--- a/lib/rexml/source.rb
+++ b/lib/rexml/source.rb
@@ -17,8 +17,8 @@ module REXML
       elsif arg.kind_of? Source
         arg
       else
-        raise "#{source.class} is not a valid input stream.  It must walk \n"+
-        "like either a String, IO, or Source."
+        raise "#{arg.class} is not a valid input stream.  It must walk \n"+
+          "like either a String, an IO, or a Source."
       end
     end
   end