diff --git a/variants/nrf52840/wio-sdk-wm1110/platformio.ini b/variants/nrf52840/wio-sdk-wm1110/platformio.ini
index 7c11ef6f6..9fac82289 100644
--- a/variants/nrf52840/wio-sdk-wm1110/platformio.ini
+++ b/variants/nrf52840/wio-sdk-wm1110/platformio.ini
@@ -9,6 +9,7 @@ extra_scripts =
 
 # Remove adafruit USB serial from the build (it is incompatible with using the ch340 serial chip on this board)
 build_unflags =
+  ${nrf52840_base.build_unflags}
   -Ofast
   -Og
   -ggdb3