diff --git a/lisp/progmodes/gdb-mi.el b/lisp/progmodes/gdb-mi.el
index 38dd0a77026..57c99abec64 100644
--- a/lisp/progmodes/gdb-mi.el
+++ b/lisp/progmodes/gdb-mi.el
@@ -594,7 +594,7 @@ filter."
 Each pattern is a regular expression.  GDB displays registers
 whose name matches any pattern in the list.  Refresh the register
 buffer for the change to take effect."
-  :type 'list
+  :type '(repeat regexp)
   :group 'gdb-buffers
   :version "28.1")