diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h
index 4397c52ec4a4..d23c5030901a 100644
--- a/include/linux/string_helpers.h
+++ b/include/linux/string_helpers.h
@@ -5,6 +5,7 @@
 #include <linux/types.h>
 
 struct file;
+struct task_struct;
 
 /* Descriptions of the types of units to
  * print in */