diff --git a/subsys/bluetooth/mesh/Kconfig b/subsys/bluetooth/mesh/Kconfig
index 030a417d58a..f1714a805bb 100644
--- a/subsys/bluetooth/mesh/Kconfig
+++ b/subsys/bluetooth/mesh/Kconfig
@@ -1152,6 +1152,7 @@ endif # BT_MESH_OP_AGG_CLI
 
 config BT_MESH_LARGE_COMP_DATA_SRV
 	bool "Support for Large Composition Data Server Model"
+	depends on BT_MESH_MODEL_EXTENSIONS
 	help
 	  Enable support for the Large Composition Data Server model.
 
diff --git a/subsys/bluetooth/mesh/large_comp_data_srv.c b/subsys/bluetooth/mesh/large_comp_data_srv.c
index f47947b9b92..d4e5af40147 100644
--- a/subsys/bluetooth/mesh/large_comp_data_srv.c
+++ b/subsys/bluetooth/mesh/large_comp_data_srv.c
@@ -170,8 +170,11 @@ const struct bt_mesh_model_op _bt_mesh_large_comp_data_srv_op[] = {
 
 static int large_comp_data_srv_init(const struct bt_mesh_model *model)
 {
-	if (!bt_mesh_model_in_primary(model)) {
-		LOG_ERR("Large Composition Data Server only allowed in primary element");
+	const struct bt_mesh_model *config_srv =
+		bt_mesh_model_find(bt_mesh_model_elem(model), BT_MESH_MODEL_ID_CFG_SRV);
+
+	if (config_srv == NULL) {
+		LOG_ERR("Large Composition Data Server cannot extend Configuration server");
 		return -EINVAL;
 	}
 
@@ -181,6 +184,8 @@ static int large_comp_data_srv_init(const struct bt_mesh_model *model)
 
 	srv.model = model;
 
+	bt_mesh_model_extend(model, config_srv);
+
 	return 0;
 }