diff --git a/sys/dev/isp/isp_freebsd.c b/sys/dev/isp/isp_freebsd.c
index 422557d2f05..a2a53750bd3 100644
--- a/sys/dev/isp/isp_freebsd.c
+++ b/sys/dev/isp/isp_freebsd.c
@@ -2802,9 +2802,10 @@ isp_async(struct ispsoftc *isp, ispasync_t cmd, void *arg)
 		isp_reinit(isp);
 		break;
 	}
+	case ISPASYNC_UNHANDLED_RESPONSE:
+		break;
 	default:
 		isp_prt(isp, ISP_LOGERR, "unknown isp_async event %d", cmd);
-		rv = -1;
 		break;
 	}
 	return (rv);