diff --git a/aucat/amsg.h b/aucat/amsg.h
index 8a57715..bba4784 100644
--- a/aucat/amsg.h
+++ b/aucat/amsg.h
@@ -83,7 +83,7 @@ struct amsg {
 		} vol;
 		struct amsg_hello {
 			uint16_t mode;		/* bitmap of MODE_XXX */
-#define AMSG_VERSION	3
+#define AMSG_VERSION	4
 			uint8_t version;	/* protocol version */
 			uint8_t reserved1[5];	/* for future use */
 			char opt[12];		/* profile name */
diff --git a/aucat/sock.c b/aucat/sock.c
index adb0c5d..b80c1ea 100644
--- a/aucat/sock.c
+++ b/aucat/sock.c
@@ -1224,7 +1224,7 @@ sock_execmsg(struct sock *f)
 		else
 			f->pstate = SOCK_STOP;
 		AMSG_INIT(m);
-		m->cmd = AMSG_ACK;
+		m->cmd = AMSG_STOP;
 		f->rstate = SOCK_RRET;
 		f->rtodo = sizeof(struct amsg);
 		break;