diff --git a/build/jam/BootRules b/build/jam/BootRules
index 3755ef0d05..c035edc076 100644
--- a/build/jam/BootRules
+++ b/build/jam/BootRules
@@ -101,6 +101,7 @@ rule SetupBoot
 		# override regular CCFLAGS/C++FLAGS, as we don't want them
 		TARGET_CCFLAGS_$(TARGET_KERNEL_ARCH) on $(object) = ;
 		TARGET_C++FLAGS_$(TARGET_KERNEL_ARCH) on $(object) = ;
+		TARGET_ASFLAGS_$(TARGET_KERNEL_ARCH) on $(object) = ;
 
 		# override warning flags
 		TARGET_WARNING_CCFLAGS_$(TARGET_KERNEL_ARCH) on $(object)