diff --git a/firmware/config/stm32f4ems/efifeatures.h b/firmware/config/stm32f4ems/efifeatures.h
index d64b9c31ba..cf1896f869 100644
--- a/firmware/config/stm32f4ems/efifeatures.h
+++ b/firmware/config/stm32f4ems/efifeatures.h
@@ -145,7 +145,9 @@
  */
 #define EFI_FILE_LOGGING TRUE
 
+#ifndef EFI_USB_SERIAL
 #define EFI_USB_SERIAL TRUE
+#endif
 
 /**
  * While we embed multiple PnP configurations into the same firmware binary, these marcoses give us control