diff --git a/include/linux/string.h b/include/linux/string.h
index 93994c6..dab2652ac 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -88,7 +88,7 @@
 extern void * memchr(const void *,int,__kernel_size_t);
 #endif
 
-extern char *kstrdup(const char *s, int gfp);
+extern char *kstrdup(const char *s, unsigned int __nocast gfp);
 
 #ifdef __cplusplus
 }