diff --git a/src/esp32/esp32_bt_gap.c b/src/esp32/esp32_bt_gap.c
index e06674b..d478651 100644
--- a/src/esp32/esp32_bt_gap.c
+++ b/src/esp32/esp32_bt_gap.c
@@ -15,6 +15,8 @@
 #include "esp_gap_ble_api.h"
 #include "nvs.h"
 
+#include "common/str_util.h"
+
 #include "frozen/frozen.h"
 
 #include "mgos_bt_gap.h"