diff --git a/subsys/bluetooth/audio/has.c b/subsys/bluetooth/audio/has.c
index ebd21ed7494..b909132e39c 100644
--- a/subsys/bluetooth/audio/has.c
+++ b/subsys/bluetooth/audio/has.c
@@ -1128,6 +1128,7 @@ int bt_has_preset_name_change(uint8_t index, const char *name)
 
 int bt_has_register(const struct bt_has_register_param *param)
 {
+	static bool registered;
 	int err;
 
 	LOG_DBG("param %p", param);
@@ -1137,6 +1138,10 @@ int bt_has_register(const struct bt_has_register_param *param)
 		return -EINVAL;
 	}
 
+	if (registered) {
+		return -EALREADY;
+	}
+
 	/* Initialize the supported features characteristic value */
 	has.features = param->type;
 
@@ -1179,5 +1184,7 @@ int bt_has_register(const struct bt_has_register_param *param)
 	k_work_init(&active_preset_work, active_preset_work_process);
 #endif /* CONFIG_BT_HAS_PRESET_SUPPORT */
 
+	registered = true;
+
 	return 0;
 }