diff --git a/sys/gnu/i386/fpemul/reg_round.s b/sys/gnu/i386/fpemul/reg_round.s
index f12e055200f5..9acc602ccf40 100644
--- a/sys/gnu/i386/fpemul/reg_round.s
+++ b/sys/gnu/i386/fpemul/reg_round.s
@@ -385,7 +385,7 @@ LRound_nearest_64:
 	jne	LDo_64_round_up
 
 	/* Now test for round-to-even */
-	test	$1,%ebx
+	testb	$1,%bl
 	jz	LCheck_truncate_64
 
 LDo_64_round_up: