diff --git a/sys/compat/linuxkpi/common/include/linux/lockdep.h b/sys/compat/linuxkpi/common/include/linux/lockdep.h
index d3e3d04db9e..d2b3d4485dd 100644
--- a/sys/compat/linuxkpi/common/include/linux/lockdep.h
+++ b/sys/compat/linuxkpi/common/include/linux/lockdep.h
@@ -32,6 +32,8 @@
 #ifndef _LINUX_LOCKDEP_H_
 #define	_LINUX_LOCKDEP_H_
 
+#include <sys/lock.h>
+
 struct lock_class_key {
 };