diff --git a/lisp/textmodes/reftex-dcr.el b/lisp/textmodes/reftex-dcr.el
index e4a63028a8f..d8d5646ea5b 100644
--- a/lisp/textmodes/reftex-dcr.el
+++ b/lisp/textmodes/reftex-dcr.el
@@ -47,7 +47,7 @@ to the functions `reftex-view-cr-cite' and `reftex-view-cr-ref'."
   (interactive "P")
   ;; See where we are.
   (let* ((macro (car (reftex-what-macro-safe 1)))
-         (key (reftex-this-word "^{}%\n\r,"))
+         (key (reftex-this-word "^{}%\n\r, \t"))
 	 dw)
 
     (if (or (null macro) (reftex-in-comment))