diff --git a/aucat/amsg.h b/aucat/amsg.h
index bba4784..057a912 100644
--- a/aucat/amsg.h
+++ b/aucat/amsg.h
@@ -38,7 +38,6 @@ struct amsg {
 #define AMSG_DATA	5	/* data block */
 #define AMSG_POS	6	/* initial position */
 #define AMSG_MOVE	7	/* position changed */
-#define AMSG_GETCAP	8	/* get capabilities */
 #define AMSG_SETVOL	9	/* set volume */
 #define AMSG_HELLO	10	/* say hello, check versions and so ... */
 #define AMSG_BYE	11	/* ask server to drop connection */
@@ -62,15 +61,6 @@ struct amsg {
 			uint32_t appbufsz;	/* client side bufsz */
 			uint32_t _reserved[1];	/* for future use */
 		} par;
-		struct amsg_cap {
-			uint32_t rate;		/* native rate */
-			uint32_t _reserved2[1];	/* for future use */
-			uint16_t rchan;		/* native rec channels */
-			uint16_t pchan;		/* native play channels */
-			uint8_t bits;		/* native bits per sample */
-			uint8_t bps;		/* native ytes per sample */
-			uint8_t _reserved[10];	/* for future use */
-		} cap;
 		struct amsg_data {
 #define AMSG_DATAMAX	0x1000
 			uint32_t size;
@@ -83,7 +73,7 @@ struct amsg {
 		} vol;
 		struct amsg_hello {
 			uint16_t mode;		/* bitmap of MODE_XXX */
-#define AMSG_VERSION	4
+#define AMSG_VERSION	5
 			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 ec1d82a..1ca9fd2 100644
--- a/aucat/sock.c
+++ b/aucat/sock.c
@@ -1289,35 +1289,6 @@ sock_execmsg(struct sock *f)
 		f->rstate = SOCK_RRET;
 		f->rtodo = sizeof(struct amsg);
 		break;
-	case AMSG_GETCAP:
-#ifdef DEBUG
-		if (debug_level >= 3) {
-			sock_dbg(f);
-			dbg_puts(": GETCAP message\n");
-		}
-#endif
-		if (f->pstate != SOCK_INIT) {
-#ifdef DEBUG
-			if (debug_level >= 1) {
-				sock_dbg(f);
-				dbg_puts(": GETCAP, bad state\n");
-			}
-#endif
-			aproc_del(f->pipe.file.rproc);
-			return 0;
-		}
-		AMSG_INIT(m);
-		m->cmd = AMSG_GETCAP;
-		m->u.cap.rate = f->dev->rate;
-		m->u.cap.pchan = (f->opt->mode & MODE_PLAY) ?
-		    (f->opt->rpar.cmax - f->opt->rpar.cmin + 1) : 0;
-		m->u.cap.rchan = (f->opt->mode & (MODE_PLAY | MODE_REC)) ?
-		    (f->opt->wpar.cmax - f->opt->wpar.cmin + 1) : 0;
-		m->u.cap.bits = ADATA_BITS;
-		m->u.cap.bps = sizeof(adata_t);
-		f->rstate = SOCK_RRET;
-		f->rtodo = sizeof(struct amsg);
-		break;
 	case AMSG_SETVOL:
 #ifdef DEBUG
 		if (debug_level >= 3) {
diff --git a/libsndio/sio_aucat.c b/libsndio/sio_aucat.c
index e617a4f..3537bed 100644
--- a/libsndio/sio_aucat.c
+++ b/libsndio/sio_aucat.c
@@ -320,23 +320,9 @@ sio_aucat_getpar(struct sio_hdl *sh, struct sio_par *par)
 static int
 sio_aucat_getcap(struct sio_hdl *sh, struct sio_cap *cap)
 {
-	struct sio_aucat_hdl *hdl = (struct sio_aucat_hdl *)sh;
 	unsigned i, bps, le, sig, chan, rindex, rmult;
 	static unsigned rates[] = { 8000, 11025, 12000 };
 
-	AMSG_INIT(&hdl->aucat.wmsg);
-	hdl->aucat.wmsg.cmd = AMSG_GETCAP;
-	hdl->aucat.wtodo = sizeof(struct amsg);
-	if (!aucat_wmsg(&hdl->aucat, &hdl->sio.eof))
-		return 0;
-	hdl->aucat.rtodo = sizeof(struct amsg);
-	if (!aucat_rmsg(&hdl->aucat, &hdl->sio.eof))
-		return 0;
-	if (hdl->aucat.rmsg.cmd != AMSG_GETCAP) {
-		DPRINTF("sio_aucat_getcap: protocol err\n");
-		hdl->sio.eof = 1;
-		return 0;
-	}
 	bps = 1;
 	sig = le = 0;
 	cap->confs[0].enc = 0;