diff --git a/examples/gcoap/gcoap_cli.c b/examples/gcoap/gcoap_cli.c
index 8cb823b8ac..a6ef88bace 100644
--- a/examples/gcoap/gcoap_cli.c
+++ b/examples/gcoap/gcoap_cli.c
@@ -41,7 +41,7 @@ static const coap_resource_t _resources[] = {
 };
 
 static gcoap_listener_t _listener = {
-    (coap_resource_t *)&_resources[0],
+    &_resources[0],
     sizeof(_resources) / sizeof(_resources[0]),
     NULL
 };
diff --git a/examples/rdcli_simple/main.c b/examples/rdcli_simple/main.c
index 48af120856..5931e64376 100644
--- a/examples/rdcli_simple/main.c
+++ b/examples/rdcli_simple/main.c
@@ -57,7 +57,7 @@ static const coap_resource_t resources[] = {
 };
 
 static gcoap_listener_t listener = {
-    .resources     = (coap_resource_t *)&resources[0],
+    .resources     = &resources[0],
     .resources_len = sizeof(resources) / sizeof(resources[0]),
     .next          = NULL
 };
diff --git a/sys/include/net/gcoap.h b/sys/include/net/gcoap.h
index ec493c18b0..f87c1817fa 100644
--- a/sys/include/net/gcoap.h
+++ b/sys/include/net/gcoap.h
@@ -433,10 +433,10 @@ extern "C" {
  * @brief   A modular collection of resources for a server
  */
 typedef struct gcoap_listener {
-    coap_resource_t *resources;     /**< First element in the array of
-                                     *   resources; must order alphabetically */
-    size_t resources_len;           /**< Length of array */
-    struct gcoap_listener *next;    /**< Next listener in list */
+    const coap_resource_t *resources;   /**< First element in the array of
+                                         *   resources; must order alphabetically */
+    size_t resources_len;               /**< Length of array */
+    struct gcoap_listener *next;        /**< Next listener in list */
 } gcoap_listener_t;
 
 /**
@@ -480,7 +480,7 @@ typedef struct {
  */
 typedef struct {
     sock_udp_ep_t *observer;            /**< Client endpoint; unused if null */
-    coap_resource_t *resource;          /**< Entity being observed */
+    const coap_resource_t *resource;    /**< Entity being observed */
     uint8_t token[GCOAP_TOKENLEN_MAX];  /**< Client token for notifications */
     unsigned token_len;                 /**< Actual length of token attribute */
 } gcoap_observe_memo_t;
diff --git a/sys/net/application_layer/gcoap/gcoap.c b/sys/net/application_layer/gcoap/gcoap.c
index 8e52b7f914..87aa1a4170 100644
--- a/sys/net/application_layer/gcoap/gcoap.c
+++ b/sys/net/application_layer/gcoap/gcoap.c
@@ -48,7 +48,7 @@ static void _expire_request(gcoap_request_memo_t *memo);
 static bool _endpoints_equal(const sock_udp_ep_t *ep1, const sock_udp_ep_t *ep2);
 static void _find_req_memo(gcoap_request_memo_t **memo_ptr, coap_pkt_t *pdu,
                            const sock_udp_ep_t *remote);
-static int _find_resource(coap_pkt_t *pdu, coap_resource_t **resource_ptr,
+static int _find_resource(coap_pkt_t *pdu, const coap_resource_t **resource_ptr,
                                             gcoap_listener_t **listener_ptr);
 static int _find_observer(sock_udp_ep_t **observer, sock_udp_ep_t *remote);
 static int _find_obs_memo(gcoap_observe_memo_t **memo, sock_udp_ep_t *remote,
@@ -62,7 +62,7 @@ const coap_resource_t _default_resources[] = {
 };
 
 static gcoap_listener_t _default_listener = {
-    (coap_resource_t *)&_default_resources[0],
+    &_default_resources[0],
     sizeof(_default_resources) / sizeof(_default_resources[0]),
     NULL
 };
@@ -267,10 +267,10 @@ static void _listen(sock_udp_t *sock)
 static size_t _handle_req(coap_pkt_t *pdu, uint8_t *buf, size_t len,
                                                          sock_udp_ep_t *remote)
 {
-    coap_resource_t *resource  = NULL;
-    gcoap_listener_t *listener = NULL;
-    sock_udp_ep_t *observer    = NULL;
-    gcoap_observe_memo_t *memo = NULL;
+    const coap_resource_t *resource     = NULL;
+    gcoap_listener_t *listener          = NULL;
+    sock_udp_ep_t *observer             = NULL;
+    gcoap_observe_memo_t *memo          = NULL;
     gcoap_observe_memo_t *resource_memo = NULL;
 
     switch (_find_resource(pdu, &resource, &listener)) {
@@ -382,7 +382,7 @@ static size_t _handle_req(coap_pkt_t *pdu, uint8_t *buf, size_t len,
  *        code didn't match and `GCOAP_RESOURCE_NO_PATH` if no matching
  *        resource was found.
  */
-static int _find_resource(coap_pkt_t *pdu, coap_resource_t **resource_ptr,
+static int _find_resource(coap_pkt_t *pdu, const coap_resource_t **resource_ptr,
                                             gcoap_listener_t **listener_ptr)
 {
     int ret = GCOAP_RESOURCE_NO_PATH;
@@ -391,7 +391,7 @@ static int _find_resource(coap_pkt_t *pdu, coap_resource_t **resource_ptr,
     /* Find path for CoAP msg among listener resources and execute callback. */
     gcoap_listener_t *listener = _coap_state.listeners;
     while (listener) {
-        coap_resource_t *resource = listener->resources;
+        const coap_resource_t *resource = listener->resources;
         for (size_t i = 0; i < listener->resources_len; i++) {
             if (i) {
                 resource++;
@@ -1008,7 +1008,7 @@ int gcoap_get_resource_list(void *buf, size_t maxlen, uint8_t cf)
 
     /* write payload */
     while (listener) {
-        coap_resource_t *resource = listener->resources;
+        const coap_resource_t *resource = listener->resources;
 
         for (unsigned i = 0; i < listener->resources_len; i++) {
             size_t path_len = strlen(resource->path);
diff --git a/tests/unittests/tests-gcoap/tests-gcoap.c b/tests/unittests/tests-gcoap/tests-gcoap.c
index 03cfa7c307..e519aaf87a 100644
--- a/tests/unittests/tests-gcoap/tests-gcoap.c
+++ b/tests/unittests/tests-gcoap/tests-gcoap.c
@@ -36,13 +36,13 @@ static const coap_resource_t resources_second[] = {
 };
 
 static gcoap_listener_t listener = {
-    .resources     = (coap_resource_t *)&resources[0],
+    .resources     = &resources[0],
     .resources_len = (sizeof(resources) / sizeof(resources[0])),
     .next          = NULL
 };
 
 static gcoap_listener_t listener_second = {
-    .resources     = (coap_resource_t *)&resources_second[0],
+    .resources     = &resources_second[0],
     .resources_len = (sizeof(resources_second) / sizeof(resources_second[0])),
     .next          = NULL
 };