diff --git a/sys/compat/linux/linux_file.c b/sys/compat/linux/linux_file.c
index b4859493bc3..2dfad3fb5d2 100644
--- a/sys/compat/linux/linux_file.c
+++ b/sys/compat/linux/linux_file.c
@@ -25,9 +25,11 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *  $Id: linux_file.c,v 1.15 1997/11/06 19:28:54 phk Exp $
+ *  $Id: linux_file.c,v 1.16 1997/12/05 19:55:37 bde Exp $
  */
 
+#include "opt_compat.h"
+
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/sysproto.h>
diff --git a/sys/i386/linux/linux_file.c b/sys/i386/linux/linux_file.c
index b4859493bc3..2dfad3fb5d2 100644
--- a/sys/i386/linux/linux_file.c
+++ b/sys/i386/linux/linux_file.c
@@ -25,9 +25,11 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *  $Id: linux_file.c,v 1.15 1997/11/06 19:28:54 phk Exp $
+ *  $Id: linux_file.c,v 1.16 1997/12/05 19:55:37 bde Exp $
  */
 
+#include "opt_compat.h"
+
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/sysproto.h>
diff --git a/sys/i386/linux/linux_sysent.c b/sys/i386/linux/linux_sysent.c
index b9bb13e93bc..6e36df4fe03 100644
--- a/sys/i386/linux/linux_sysent.c
+++ b/sys/i386/linux/linux_sysent.c
@@ -5,6 +5,8 @@
  * created from	Id: syscalls.master,v 1.5 1997/04/09 15:34:09 bde Exp 
  */
 
+#include "opt_compat.h"
+
 #include <sys/param.h>
 #include <sys/sysent.h>
 #include <sys/sysproto.h>