diff --git a/usr.bin/sed/main.c b/usr.bin/sed/main.c
index eafdbe9902d..dfb07826e9a 100644
--- a/usr.bin/sed/main.c
+++ b/usr.bin/sed/main.c
@@ -205,7 +205,7 @@ usage(void)
 {
 	(void)fprintf(stderr,
 	    "usage: %s script [-Ealnru] [-i[<extension>]] [file ...]\n"
-	    "\t%s [-Ealnu] [-i[<extension>]] [-e script] ... [-f script_file]"
+	    "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
 	    " ... [file ...]\n", getprogname(), getprogname());
 	exit(1);
 }