diff --git a/arch/s390/include/asm/string.h b/arch/s390/include/asm/string.h
index d074673..adf0791 100644
--- a/arch/s390/include/asm/string.h
+++ b/arch/s390/include/asm/string.h
@@ -135,7 +135,13 @@
 		: "+a" (end), "+a" (tmp) : "d" (r0)  : "cc");
 	return end - s;
 }
-
+#else /* IN_ARCH_STRING_C */
+void *memchr(const void * s, int c, size_t n);
+void *memscan(void *s, int c, size_t n);
+char *strcat(char *dst, const char *src);
+char *strcpy(char *dst, const char *src);
+size_t strlen(const char *s);
+size_t strnlen(const char * s, size_t n);
 #endif /* !IN_ARCH_STRING_C */
 
 #endif /* __KERNEL__ */