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-rw-r--r--py/circuitpy_defns.mk3
1 files changed, 3 insertions, 0 deletions
diff --git a/py/circuitpy_defns.mk b/py/circuitpy_defns.mk
index f907bf7ae..c6dfbb5f2 100644
--- a/py/circuitpy_defns.mk
+++ b/py/circuitpy_defns.mk
@@ -286,6 +286,9 @@ endif
ifeq ($(CIRCUITPY_UHEAP),1)
SRC_PATTERNS += uheap/%
endif
+ifeq ($(CIRCUITPY_USB_CDC),1)
+SRC_PATTERNS += usb_cdc/%
+endif
ifeq ($(CIRCUITPY_USB_HID),1)
SRC_PATTERNS += usb_hid/%
endif