diff --git a/firmware/SOURCES b/firmware/SOURCES
index e7d882082c..0f6c21d673 100644
--- a/firmware/SOURCES
+++ b/firmware/SOURCES
@@ -516,7 +516,9 @@ target/arm/imx233/power-imx233.c
 target/arm/imx233/powermgmt-imx233.c
 target/arm/imx233/adc-imx233.c
 target/arm/imx233/lradc-imx233.c
+#ifndef BOOTLOADER
 target/arm/imx233/debug-imx233.c
+#endif
 #if !defined(BOOTLOADER) || defined(HAVE_BOOTLOADER_USB_MODE)
 target/arm/imx233/usb-imx233.c
 #endif