diff --git a/include/net/zoap.h b/include/net/zoap.h
index 8ccba5bc097..472143f2f99 100644
--- a/include/net/zoap.h
+++ b/include/net/zoap.h
@@ -494,16 +494,6 @@ bool zoap_request_is_observe(const struct zoap_packet *request);
  */
 uint8_t *zoap_packet_get_payload(struct zoap_packet *pkt, uint16_t *len);
 
-/**
- * @brief Returns the internal buffer of the CoAP packet, appending
- * the COAP_MARKER to the buffer if necessary.
- *
- * @param pkt Packet to get (or insert) the payload
- *
- * @return pointer to the net_buf storing the payload.
- */
-struct net_buf *zoap_packet_get_buf(struct zoap_packet *pkt);
-
 /**
  * @brief Sets how much space was used by the payload.
  *
diff --git a/subsys/net/lib/zoap/zoap.c b/subsys/net/lib/zoap/zoap.c
index cfe6afb9003..8197c55486a 100644
--- a/subsys/net/lib/zoap/zoap.c
+++ b/subsys/net/lib/zoap/zoap.c
@@ -834,19 +834,6 @@ int zoap_packet_set_used(struct zoap_packet *pkt, uint16_t len)
 	return 0;
 }
 
-struct net_buf *zoap_packet_get_buf(struct zoap_packet *pkt)
-{
-	uint8_t *str;
-
-	if (!pkt->start) {
-		str = net_buf_add(pkt->buf->frags, 1);
-		*str = COAP_MARKER;
-		pkt->start = str + 1;
-	}
-
-	return pkt->buf->frags;
-}
-
 int zoap_add_option(struct zoap_packet *pkt, uint16_t code,
 		    const void *value, uint16_t len)
 {