diff --git a/src/kernel/project.conf b/src/kernel/project.conf
index 1b23f83..b96ddc6 100644
--- a/src/kernel/project.conf
+++ b/src/kernel/project.conf
@@ -1,7 +1,7 @@
 targets=crtbegin.o,crtend.o,crti.o,crtn.o,uKernel.bin
 as=$(CC)
 cc=$(CROSS)gcc
-cppflags_force=-nostdinc -isystem ../../include -isystem ../../src/lib/libc/include -isystem ../../src/lib/libc/include/dl -I..
+cppflags_force=-nostdinc -isystem ../../include -isystem ../../src/lib/libc/include -isystem ../../src/lib/libc/include/dl -I.. -D__DeforaOS__
 asflags_force=$(CFLAGSF) -c
 asflags=$(CFLAGS)
 cflags_force=`../../tools/platform.sh -V UKERNEL_CFLAGS -C "$$ARCH"`