diff --git a/radio/src/targets/common/arm/stm32/CMakeLists.txt b/radio/src/targets/common/arm/stm32/CMakeLists.txt
index 93d6f9f256..8b13dacd4a 100644
--- a/radio/src/targets/common/arm/stm32/CMakeLists.txt
+++ b/radio/src/targets/common/arm/stm32/CMakeLists.txt
@@ -96,6 +96,7 @@ if(DEBUG OR CLI OR USB_SERIAL)
 
 #disable USB_SERIAL if it will exceed flash size
 if ((NOT TRANSLATIONS STREQUAL EN) AND DFPLAYER STREQUAL YES AND USB_MSD STREQUAL YES AND PCBI6X_ELRS STREQUAL YES AND PCBI6X_INAV STREQUAL YES AND USB_SERIAL STREQUAL YES)
+  message(WARNING "USB_SERIAL will be disabled")
   remove_definitions(-DUSB_SERIAL)
 endif()
 endif()