diff --git a/daemon/codec.c b/daemon/codec.c
index 8ef03c059..3884f335b 100644
--- a/daemon/codec.c
+++ b/daemon/codec.c
@@ -4536,6 +4536,13 @@ static struct codec_tracker *codec_tracker_init(void) {
 	return NULL;
 #endif
 }
+static void codec_touched_real(struct codec_store *cs, struct rtp_payload_type *pt) {
+#ifdef WITH_TRANSCODING
+	if (pt->codec_def && pt->codec_def->supplemental)
+		return;
+	g_hash_table_replace(cs->tracker->touched, GUINT_TO_POINTER(pt->clock_rate), (void *) 0x1);
+#endif
+}
 static void codec_touched(struct codec_store *cs, struct rtp_payload_type *pt) {
 #ifdef WITH_TRANSCODING
 	if (pt->codec_def && pt->codec_def->supplemental) {
@@ -4917,7 +4924,7 @@ void codec_store_strip(struct codec_store *cs, GQueue *strip, GHashTable *except
 							" (%i) due to strip=all or strip=full",
 							STR_FMT(&pt->encoding_with_params),
 							pt->payload_type);
-					codec_touched(cs, pt);
+					codec_touched_real(cs, pt);
 					next = __codec_store_delete_link(link, cs);
 				}
 				link = next;
@@ -4938,7 +4945,7 @@ void codec_store_strip(struct codec_store *cs, GQueue *strip, GHashTable *except
 			if (pt) {
 				ilogs(codec, LOG_DEBUG, "Stripping codec " STR_FORMAT " (%i)",
 						STR_FMT(&pt->encoding_with_params), pt_num);
-				codec_touched(cs, pt);
+				codec_touched_real(cs, pt);
 				__codec_store_delete_link(pt->prefs_link, cs);
 				// this removes pts->head
 			}
diff --git a/t/auto-daemon-tests.pl b/t/auto-daemon-tests.pl
index 1e6b6afe0..98f8a2340 100755
--- a/t/auto-daemon-tests.pl
+++ b/t/auto-daemon-tests.pl
@@ -18588,6 +18588,65 @@ SDP
 
 
 
+new_call;
+
+offer('strip CN',
+	{ ICE => 'remove', replace => ['origin'],
+	codec => { strip => [qw/PCMU RED CN G729/]} }, <<SDP);
+v=0
+o=- 100263 0 IN IP4 127.0.0.1
+s=session
+c=IN IP4 52.113.56.34
+b=CT:10000000
+t=0 0
+m=audio 49954 RTP/AVP 104 9 103 111 18 0 8 97 101 13 118
+c=IN IP4 52.113.56.34
+a=rtcp:49955
+a=label:main-audio
+a=mid:1
+a=sendrecv
+a=rtpmap:104 SILK/16000
+a=rtpmap:9 G722/8000
+a=rtpmap:103 SILK/8000
+a=rtpmap:111 SIREN/16000
+a=fmtp:111 bitrate=16000
+a=rtpmap:18 G729/8000
+a=fmtp:18 annexb=no
+a=rtpmap:0 PCMU/8000
+a=rtpmap:8 PCMA/8000
+a=rtpmap:97 RED/8000
+a=rtpmap:101 telephone-event/8000
+a=fmtp:101 0-16
+a=rtpmap:13 CN/8000
+a=rtpmap:118 CN/16000
+a=ptime:20
+----------------------------------
+v=0
+o=- 100263 0 IN IP4 203.0.113.1
+s=session
+c=IN IP4 52.113.56.34
+b=CT:10000000
+t=0 0
+m=audio PORT RTP/AVP 104 9 103 111 8 101
+c=IN IP4 203.0.113.1
+a=label:main-audio
+a=mid:1
+a=rtpmap:104 SILK/16000
+a=rtpmap:9 G722/8000
+a=rtpmap:103 SILK/8000
+a=rtpmap:111 SIREN/16000
+a=fmtp:111 bitrate=16000
+a=rtpmap:8 PCMA/8000
+a=rtpmap:101 telephone-event/8000
+a=fmtp:101 0-16
+a=sendrecv
+a=rtcp:PORT
+a=ptime:20
+SDP
+
+
+
+
 ($sock_a, $sock_b) = new_call([qw(198.51.100.1 8050)], [qw(198.51.100.3 8052)]);
 
 ($port_a) = offer('reverse DTMF transcoding - no-op', { ICE => 'remove', replace => ['origin'],