diff --git a/lisp/textmodes/reftex.el b/lisp/textmodes/reftex.el
index 8db74a41090..cd4a8d12c27 100644
--- a/lisp/textmodes/reftex.el
+++ b/lisp/textmodes/reftex.el
@@ -533,7 +533,7 @@ on the menu bar.
           (buffer-file-name)))))
     (cond
      ((null master)
-      (error "Need a filename for this buffer,  please save it first"))
+      (error "Need a filename for this buffer, please save it first"))
      ((or (file-exists-p (concat master ".tex"))
           (reftex-get-buffer-visiting (concat master ".tex")))
       ;; Ahh, an extra .tex was missing...