diff --git a/src/system/boot/arch/arm/Jamfile b/src/system/boot/arch/arm/Jamfile
index 0b7e1e352a..cd3dd05748 100644
--- a/src/system/boot/arch/arm/Jamfile
+++ b/src/system/boot/arch/arm/Jamfile
@@ -1,7 +1,5 @@
 SubDir HAIKU_TOP src system boot arch arm ;
 
-#DEFINES += _BOOT_MODE ;
-
 #XXX: should not be needed here
 UsePrivateHeaders [ FDirName kernel arch $(TARGET_ARCH) board $(TARGET_BOOT_BOARD) ] ;