diff --git a/Makefile b/Makefile
index 1b3dfc4a..7d9222dd 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,6 @@ CFLAGS += -Ifreebsd/lib/libkvm
 CFLAGS += -Ifreebsd/lib/libmemstat
 CFLAGS += -Ifreebsd/lib/libipsec
 CFLAGS += -Itestsuite/include
-CFLAGS += -D__FreeBSD__
 CFLAGS += -D__DBINTERFACE_PRIVATE
 CFLAGS += -DINET6
 CFLAGS += -w
diff --git a/freebsd-to-rtems.py b/freebsd-to-rtems.py
index ce8ca10d..18b1c193 100755
--- a/freebsd-to-rtems.py
+++ b/freebsd-to-rtems.py
@@ -421,7 +421,6 @@ class ModuleManager:
 			'CFLAGS += -Ifreebsd/lib/libmemstat\n' \
 			'CFLAGS += -Ifreebsd/lib/libipsec\n' \
 			'CFLAGS += -Itestsuite/include\n' \
-			'CFLAGS += -D__FreeBSD__\n' \
 			'CFLAGS += -D__DBINTERFACE_PRIVATE\n' \
 			'CFLAGS += -DINET6\n' \
 			'CFLAGS += -w\n' \
diff --git a/rtemsbsd/include/machine/rtems-bsd-kernel-space.h.in b/rtemsbsd/include/machine/rtems-bsd-kernel-space.h.in
index 8833472a..2191f36e 100644
--- a/rtemsbsd/include/machine/rtems-bsd-kernel-space.h.in
+++ b/rtemsbsd/include/machine/rtems-bsd-kernel-space.h.in
@@ -47,6 +47,8 @@
 #define	__GLOBL1(sym)	__asm__(".globl " #sym)
 #define	__GLOBL(sym)	__GLOBL1(sym)
 
+#define __FreeBSD__ 1
+
 /* General define to activate BSD kernel parts */
 #define _KERNEL 1
 
diff --git a/rtemsbsd/include/machine/rtems-bsd-user-space.h b/rtemsbsd/include/machine/rtems-bsd-user-space.h
index 64d3cb0f..b4f74a55 100644
--- a/rtemsbsd/include/machine/rtems-bsd-user-space.h
+++ b/rtemsbsd/include/machine/rtems-bsd-user-space.h
@@ -40,6 +40,8 @@
 #ifndef _RTEMS_BSD_MACHINE_RTEMS_BSD_USER_SPACE_H_
 #define _RTEMS_BSD_MACHINE_RTEMS_BSD_USER_SPACE_H_
 
+#define __FreeBSD__ 1
+
 #include <sys/cdefs.h>
 
 #include <stdio.h>