diff --git a/port/libusb/main.c b/port/libusb/main.c
index 287abea63..957850b5c 100644
--- a/port/libusb/main.c
+++ b/port/libusb/main.c
@@ -50,6 +50,7 @@
 #include <string.h>
 #include <signal.h>
 #include <unistd.h>
+#include <hci_dump_posix_stdout.h>
 
 #include "btstack_config.h"
 
diff --git a/src/ble/att_db.c b/src/ble/att_db.c
index 472563d08..75a7d91aa 100644
--- a/src/ble/att_db.c
+++ b/src/ble/att_db.c
@@ -1350,7 +1350,7 @@ uint16_t att_handle_request(att_connection_t * att_connection,
 bool gatt_server_get_handle_range_for_service_with_uuid16(uint16_t uuid16, uint16_t * start_handle, uint16_t * end_handle){
     bool in_group    = false;
     uint16_t prev_handle = 0;
-    uint16_t service_start;
+    uint16_t service_start = 0;
 
     uint8_t attribute_value[2];
     int attribute_len = sizeof(attribute_value);