diff --git a/arch/sh/include/asm/uaccess_64.h b/arch/sh/include/asm/uaccess_64.h
index 0042c9054b20..56fd20b8cdcc 100644
--- a/arch/sh/include/asm/uaccess_64.h
+++ b/arch/sh/include/asm/uaccess_64.h
@@ -85,5 +85,7 @@ extern long __put_user_asm_q(void *, long);
 extern void __put_user_unknown(void);
 
 extern long __strnlen_user(const char *__s, long __n);
+extern int __strncpy_from_user(unsigned long __dest,
+	       unsigned long __user __src, int __count);
 
 #endif /* __ASM_SH_UACCESS_64_H */