--- latex.el.old	2013-01-14 01:43:08.000000000 +0100
+++ latex.el	2013-01-14 01:44:09.000000000 +0100
@@ -1563,7 +1563,7 @@
 the list of defined environments."
   (let ((environment (completing-read (TeX-argument-prompt optional prompt
 							   "Environment")
-				      (TeX-symbol-list))))
+				      (LaTeX-environment-list))))
     (if (and definition (not (string-equal "" environment)))
 	(LaTeX-add-environments environment))