1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/emulation/viper-ex.el b/lisp/emulation/viper-ex.el
index dc4d1c3eebd..4d3b8fd0921 100644
--- a/lisp/emulation/viper-ex.el
+++ b/lisp/emulation/viper-ex.el
@@ -151,7 +151,7 @@
            "\\)")
           shell-file-name)))
   "Is the user using a unix-type shell under a non-OS?"
-  :type 'string
+  :type 'boolean
   :group 'viper-ex)
 
 (defcustom ex-unix-type-shell-options