diff --git a/sys/compat/linux/linux_elf.c b/sys/compat/linux/linux_elf.c
index 43df9508d47..cde72e3ed99 100644
--- a/sys/compat/linux/linux_elf.c
+++ b/sys/compat/linux/linux_elf.c
@@ -40,6 +40,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include "opt_compat.h"
+
 #include <sys/param.h>
 #include <sys/exec.h>
 #include <sys/imgact.h>