diff --git a/src/adapter.c b/src/adapter.c
index d996257..38e4043 100644
--- a/src/adapter.c
+++ b/src/adapter.c
@@ -3694,7 +3694,7 @@ void adapter_update_found_devices(struct btd_adapter *adapter,
 					const bdaddr_t *bdaddr,
 					uint8_t bdaddr_type, int8_t rssi,
 					bool confirm, bool legacy,
-					uint8_t *data, uint8_t data_len)
+					const uint8_t *data, uint8_t data_len)
 {
 	struct discovery *discovery = adapter->discovery;
 	struct btd_device *dev;
diff --git a/src/adapter.h b/src/adapter.h
index 43fb3ea..5a9c0a1 100644
--- a/src/adapter.h
+++ b/src/adapter.h
@@ -99,7 +99,7 @@ void adapter_update_found_devices(struct btd_adapter *adapter,
 					const bdaddr_t *bdaddr,
 					uint8_t bdaddr_type, int8_t rssi,
 					bool confirm_name, bool legacy,
-					uint8_t *data, uint8_t data_len);
+					const uint8_t *data, uint8_t data_len);
 int adapter_set_name(struct btd_adapter *adapter, const char *name);
 void adapter_service_insert(struct btd_adapter *adapter, void *rec);
 void adapter_service_remove(struct btd_adapter *adapter, void *rec);