diff --git a/samples/bluetooth/peripheral_ots/prj.conf b/samples/bluetooth/peripheral_ots/prj.conf
index c8020519dcf..83785cb0a37 100644
--- a/samples/bluetooth/peripheral_ots/prj.conf
+++ b/samples/bluetooth/peripheral_ots/prj.conf
@@ -8,3 +8,4 @@ CONFIG_BT_OTS_OACP_WRITE_SUPPORT=y
 CONFIG_BT_OTS_OACP_PATCH_SUPPORT=y
 
 CONFIG_LOG=y
+CONFIG_ASSERT=y
diff --git a/subsys/bluetooth/services/ots/ots_dir_list.c b/subsys/bluetooth/services/ots/ots_dir_list.c
index 03ca639f619..d4cee3c68c5 100644
--- a/subsys/bluetooth/services/ots/ots_dir_list.c
+++ b/subsys/bluetooth/services/ots/ots_dir_list.c
@@ -45,7 +45,7 @@ static void dir_list_object_encode(struct bt_gatt_ots_object *obj,
 	/* Name length */
 	obj_name_len = strlen(obj->metadata.name);
 	__ASSERT(obj_name_len > 0 && obj_name_len <= CONFIG_BT_OTS_OBJ_MAX_NAME_LEN,
-		 "Dir list object len is incorrect %zu", len);
+		 "Dir list object len is incorrect %zu", obj_name_len);
 	net_buf_simple_add_u8(net_buf, obj_name_len);
 
 	/* Name */
@@ -170,7 +170,7 @@ static void dir_list_encode(struct bt_ots_dir_list *dir_list, void *obj_manager)
 
 	err = bt_gatt_ots_obj_manager_first_obj_get(obj_manager, &obj);
 
-	__ASSERT(err == 0 && first_obj == dir_list->dir_list_obj,
+	__ASSERT(err == 0 && obj == dir_list->dir_list_obj,
 		 "Expecting first object to be the Directory Listing Object");
 
 	/* Init with len = 0 to reset data */
@@ -210,7 +210,7 @@ void bt_ots_dir_list_init(struct bt_ots_dir_list **dir_list, void *obj_manager)
 	int err;
 	static char *dir_list_obj_name = CONFIG_BT_OTS_DIR_LIST_OBJ_NAME;
 
-	__ASSERT(*dir_list, "Already initialized");
+	__ASSERT(*dir_list == NULL, "Already initialized");
 
 	for (int i = 0; i < ARRAY_SIZE(dir_lists); i++) {
 		if (!dir_lists[i].dir_list_obj) {
@@ -226,7 +226,7 @@ void bt_ots_dir_list_init(struct bt_ots_dir_list **dir_list, void *obj_manager)
 
 	err = bt_gatt_ots_obj_manager_obj_add(obj_manager, &dir_list_obj);
 
-	__ASSERT(!err, "Could not add Directory Listing Object for object manager %p", obj_man);
+	__ASSERT(!err, "Could not add Directory Listing Object for object manager %p", obj_manager);
 
 	memset(&dir_list_obj->metadata, 0, sizeof(dir_list_obj->metadata));
 	dir_list_obj->metadata.name = dir_list_obj_name;