src/cmd/8g/peep.c | 4 ++--

diff --git a/src/cmd/8g/peep.c b/src/cmd/8g/peep.c
index f902674ecaf95a66e442c65654b7aa5af74ace21..e2f3a003d35b3f45a5970425c753e22f036878ca 100644
--- a/src/cmd/8g/peep.c
+++ b/src/cmd/8g/peep.c
@@ -634,9 +634,9 @@  */
 static int
 copyas(Adr *a, Adr *v)
 {
-	if(D_AL <= a->type && a->type <= D_R15B)
+	if(D_AL <= a->type && a->type <= D_BL)
 		fatal("use of byte register");
-	if(D_AL <= v->type && v->type <= D_R15B)
+	if(D_AL <= v->type && v->type <= D_BL)
 		fatal("use of byte register");
 
 	if(a->type != v->type)