diff --git a/sbin/geom/core/geom.c b/sbin/geom/core/geom.c
index d83a232e6785..1be9b0c37a3e 100644
--- a/sbin/geom/core/geom.c
+++ b/sbin/geom/core/geom.c
@@ -262,7 +262,7 @@ set_option(struct gctl_req *req, struct g_option *opt, const char *val)
 	if (G_OPT_TYPE(opt) == G_TYPE_NUMBER ||
 	    G_OPT_TYPE(opt) == G_TYPE_ASCNUM) {
 		if (expand_number(val, &number) == -1) {
-			err(EXIT_FAILURE, "Invalid value for '%c' argument.",
+			err(EXIT_FAILURE, "Invalid value for '%c' argument",
 			    opt->go_char);
 		}
 		if (G_OPT_TYPE(opt) == G_TYPE_NUMBER) {