diff --git a/firmware/Makefile b/firmware/Makefile
index 8abc06c84b..b345464590 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -296,7 +296,6 @@ INCDIR = \
   $(CONFDIR) \
   ext/FatFS \
   $(PROJECT_DIR)/hw_layer/mass_storage \
-  $(PROJECT_DIR)/hw_layer/serial_over_usb \
   $(HW_INC) \
   $(PROJECT_DIR)/development/hw_layer \
   development/test \