diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 7e1160dde5e7cd052fcf67ac2852f7ecc1bb7062..06fe93a3e916d882fa09fe4275ed9cbf922ac8c0 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -8,6 +8,8 @@
 #ifndef __LINUX_LOCKDEP_H
 #define __LINUX_LOCKDEP_H
 
+struct task_struct;
+
 #ifdef CONFIG_LOCKDEP
 
 #include <linux/linkage.h>