diff --git a/subsys/bluetooth/mesh/Kconfig b/subsys/bluetooth/mesh/Kconfig
index 25fb2e870d4..085d72c3b18 100644
--- a/subsys/bluetooth/mesh/Kconfig
+++ b/subsys/bluetooth/mesh/Kconfig
@@ -712,7 +712,7 @@ config BT_MESH_MODEL_EXTENSIONS
 
 config BT_MESH_COMP_PAGE_1
 	bool "Support for Composition Data Page 1"
-	depends on BT_MESH_MODEL_EXTENSIONS
+	default y
 	help
 	  Enable support for Composition Data Page 1.
 
@@ -720,6 +720,7 @@ config BT_MESH_MODEL_EXTENSION_LIST_SIZE
 	int "Model extensions list size"
 	depends on BT_MESH_COMP_PAGE_1
 	range 0 255
+	default 0 if !BT_MESH_MODEL_EXTENSIONS
 	default 10
 	help
 	  This option specifies how many models relations can be saved.
diff --git a/subsys/bluetooth/mesh/access.c b/subsys/bluetooth/mesh/access.c
index 4ff80333187..328ec0dd281 100644
--- a/subsys/bluetooth/mesh/access.c
+++ b/subsys/bluetooth/mesh/access.c
@@ -1066,13 +1066,13 @@ int bt_mesh_comp_register(const struct bt_mesh_comp *comp)
 
 	err = 0;
 
-	if (IS_ENABLED(CONFIG_BT_MESH_COMP_PAGE_1)) {
+	if (MOD_REL_LIST_SIZE > 0) {
 		memset(mod_rel_list, 0, sizeof(mod_rel_list));
 	}
 
 	bt_mesh_model_foreach(mod_init, &err);
 
-	if (IS_ENABLED(CONFIG_BT_MESH_COMP_PAGE_1)) {
+	if (MOD_REL_LIST_SIZE > 0) {
 		int i;
 
 		MOD_REL_LIST_FOR_EACH(i) {
@@ -1744,7 +1744,8 @@ static int mod_rel_register(const struct bt_mesh_model *base,
 			return 0;
 		}
 	}
-	LOG_ERR("Failed to extend");
+
+	LOG_ERR("CONFIG_BT_MESH_MODEL_EXTENSION_LIST_SIZE is too small");
 	return -ENOMEM;
 }
 
@@ -1784,8 +1785,11 @@ int bt_mesh_model_extend(const struct bt_mesh_model *extending_mod,
 	}
 
 register_extension:
-	if (IS_ENABLED(CONFIG_BT_MESH_COMP_PAGE_1)) {
+	if (MOD_REL_LIST_SIZE > 0) {
 		return mod_rel_register(base_mod, extending_mod, RELATION_TYPE_EXT);
+	} else if (IS_ENABLED(CONFIG_BT_MESH_COMP_PAGE_1)) {
+		LOG_ERR("CONFIG_BT_MESH_MODEL_EXTENSION_LIST_SIZE is too small");
+		return -ENOMEM;
 	}
 
 	return 0;
@@ -1797,7 +1801,7 @@ int bt_mesh_model_correspond(const struct bt_mesh_model *corresponding_mod,
 	int i, err;
 	uint8_t cor_id = 0;
 
-	if (!IS_ENABLED(CONFIG_BT_MESH_COMP_PAGE_1)) {
+	if (MOD_REL_LIST_SIZE == 0) {
 		return -ENOTSUP;
 	}