diff --git a/sys/compat/linuxkpi/common/include/linux/poison.h b/sys/compat/linuxkpi/common/include/linux/poison.h
new file mode 100644
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/poison.h
@@ -0,0 +1,9 @@
+/* Public domain. */
+
+#ifndef _LINUX_POISON_H
+#define _LINUX_POISON_H
+
+#define POISON_INUSE	0xdb
+#define POISON_FREE	0xdf
+
+#endif