diff --git a/sys/compat/linuxkpi/common/include/linux/lockdep.h b/sys/compat/linuxkpi/common/include/linux/lockdep.h
index 70a4e45867f..93fe445f705 100644
--- a/sys/compat/linuxkpi/common/include/linux/lockdep.h
+++ b/sys/compat/linuxkpi/common/include/linux/lockdep.h
@@ -30,6 +30,7 @@
 #ifndef _LINUXKPI_LINUX_LOCKDEP_H_
 #define	_LINUXKPI_LINUX_LOCKDEP_H_
 
+#include <sys/systm.h>
 #include <sys/types.h>
 #include <sys/lock.h>