diff --git a/src/pico_keys.h b/src/pico_keys.h
index 0fc6b0d..ffe3b8a 100644
--- a/src/pico_keys.h
+++ b/src/pico_keys.h
@@ -63,6 +63,7 @@ static inline void put_uint16_t(uint16_t n, uint8_t *b) {
 }
 
 extern void low_flash_available();
+extern int flash_clear_file(file_t *file);
 
 extern void timeout_stop();
 extern void timeout_start();
diff --git a/src/usb/hid/hid.c b/src/usb/hid/hid.c
index 80ea2d2..738c658 100644
--- a/src/usb/hid/hid.c
+++ b/src/usb/hid/hid.c
@@ -427,11 +427,6 @@ int driver_process_usb_packet_hid(uint16_t read) {
             memset(ctap_resp, 0, 64);
             ctap_resp->cid = ctap_req->cid;
             ctap_resp->init.cmd = ctap_req->init.cmd;
-#ifdef ENABLE_EMULATION
-            struct {
-                uint8_t id[8];
-            } rpiid = { 0 };
-#endif
             memcpy(ctap_resp->init.data, pico_serial.id, sizeof(pico_serial.id));
             ctap_resp->init.bcntl = 16;
             hid_write(64);