diff --git a/Tupfile b/Tupfile
index 2191fa0..57e161f 100644
--- a/Tupfile
+++ b/Tupfile
@@ -1,7 +1,7 @@
 include_rules
 
 LDFLAGS = -z max-page-size=4096 --orphan-handling=error -T kernel.ld 
-ASFLAGS = -m68010 -spaces -Felf -ldots -align -quiet -x -nowarn=62 
+ASFLAGS = -m68010 -spaces -Felf -ldots -align -quiet -x -nowarn=62 -D__FREESTANDING
 
 : foreach *.68k | ../<include> |> vasmm68k_mot $(ASFLAGS) -I../sysroot/usr/include -o %o %f |> %B.o
 : *.o | kernel.ld ../<libstd> |> m68k-elf-ld $(LDFLAGS)  -o %o %f '%<libstd>' |> kernel