diff --git a/include/asm-s390/schid.h b/include/asm-s390/schid.h
index 7bdc0fe15691df26c41722e574817c449bb9f65f..825503cf3dc2fa6f97a92b927debf3ed71add376 100644
--- a/include/asm-s390/schid.h
+++ b/include/asm-s390/schid.h
@@ -11,6 +11,7 @@ struct subchannel_id {
 } __attribute__ ((packed, aligned(4)));
 
 #ifdef __KERNEL__
+#include <linux/string.h>
 
 /* Helper function for sane state of pre-allocated subchannel_id. */
 static inline void