diff --git a/lisp/generic-x.el b/lisp/generic-x.el
index e0fb811f88b..9ba06d42397 100644
--- a/lisp/generic-x.el
+++ b/lisp/generic-x.el
@@ -492,7 +492,7 @@ like an INI file.  You can add this hook to `find-file-hook'."
 	"MD"	    "md"	 "Md"
 	"PATH"	    "path"	 "Path"
 	"PAUSE"	    "pause"	 "Pause"
-	"PROMPT"	    "prompt"	 "Prompt"
+	"PROMPT"    "prompt"	 "Prompt"
 	"RD"	    "rd"	 "Rd"
 	"REN"	    "ren"	 "Ren"
 	"SET"	    "set"	 "Set"