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-rw-r--r--stmhal/usb.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/stmhal/usb.h b/stmhal/usb.h
index 594e99e18d..168bfbd5fe 100644
--- a/stmhal/usb.h
+++ b/stmhal/usb.h
@@ -41,7 +41,7 @@ typedef enum {
USB_STORAGE_MEDIUM_SDCARD,
} usb_storage_medium_t;
-const mp_obj_type_t pyb_usb_vcp_type;
+extern const mp_obj_type_t pyb_usb_vcp_type;
void pyb_usb_init0(void);
void pyb_usb_dev_init(usb_device_mode_t mode, usb_storage_medium_t medium);