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-rw-r--r--cores/arduino/USBAPI.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/cores/arduino/USBAPI.h b/cores/arduino/USBAPI.h
index eb2e593..1a4183b 100644
--- a/cores/arduino/USBAPI.h
+++ b/cores/arduino/USBAPI.h
@@ -25,6 +25,8 @@ extern USBDevice_ USBDevice;
//================================================================================
// Serial over CDC (Serial1 is the physical port)
+struct ring_buffer;
+
class Serial_ : public Stream
{
private:
@@ -193,4 +195,4 @@ void USB_Flush(uint8_t ep);
#endif
-#endif /* if defined(USBCON) */ \ No newline at end of file
+#endif /* if defined(USBCON) */