diff --git a/src/coap_client.c b/src/coap_client.c
index fac7287b2..0ce138612 100644
--- a/src/coap_client.c
+++ b/src/coap_client.c
@@ -696,11 +696,10 @@ enum golioth_status golioth_coap_client_observe(struct golioth_client *client,
 }
 
 enum golioth_status golioth_coap_client_observe_release(struct golioth_client *client,
+                                                        const uint8_t token[GOLIOTH_COAP_TOKEN_LEN],
                                                         const char *path_prefix,
                                                         const char *path,
                                                         enum golioth_content_type content_type,
-                                                        uint8_t *token,
-                                                        size_t token_len,
                                                         void *arg)
 {
     if (!client || !path)
diff --git a/src/coap_client.h b/src/coap_client.h
index d384519f6..b98f679ee 100644
--- a/src/coap_client.h
+++ b/src/coap_client.h
@@ -238,11 +238,10 @@ enum golioth_status golioth_coap_client_observe(struct golioth_client *client,
                                                 void *callback_arg);
 
 enum golioth_status golioth_coap_client_observe_release(struct golioth_client *client,
+                                                        const uint8_t token[GOLIOTH_COAP_TOKEN_LEN],
                                                         const char *path_prefix,
                                                         const char *path,
                                                         enum golioth_content_type content_type,
-                                                        uint8_t *token,
-                                                        size_t token_len,
                                                         void *arg);
 
 void golioth_coap_client_cancel_all_observations(struct golioth_client *client);
diff --git a/src/coap_client_libcoap.c b/src/coap_client_libcoap.c
index 413b3a329..f2432091a 100644
--- a/src/coap_client_libcoap.c
+++ b/src/coap_client_libcoap.c
@@ -648,11 +648,10 @@ void golioth_cancel_all_observations_by_prefix(struct golioth_client *client, co
 
             obs_info->in_use = false;
             golioth_coap_client_observe_release(client,
+                                                obs_info->req.token,
                                                 obs_info->req.path_prefix,
                                                 obs_info->req.path,
                                                 obs_info->req.observe.content_type,
-                                                obs_info->req.token,
-                                                GOLIOTH_COAP_TOKEN_LEN,
                                                 NULL);
         }
     }
diff --git a/src/zephyr_coap_req.c b/src/zephyr_coap_req.c
index 24dcf9501..815a8494a 100644
--- a/src/zephyr_coap_req.c
+++ b/src/zephyr_coap_req.c
@@ -839,11 +839,10 @@ static int __golioth_coap_req_find_and_cancel_observation(
 
             /* Enqueue an "eager release" request for this observation */
             err = golioth_coap_client_observe_release(client,
+                                                      coap_token,
                                                       req_msg->path_prefix,
                                                       req_msg->path,
                                                       coap_content_format,
-                                                      coap_token,
-                                                      GOLIOTH_COAP_TOKEN_LEN,
                                                       NULL);
             if (err)
             {