diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index a4a0588c5397..bfef0be279dd 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -723,7 +723,7 @@ asmlinkage long sys_move_pages(pid_t pid, unsigned long nr_pages,
 				int flags);
 asmlinkage long sys_mbind(unsigned long start, unsigned long len,
 				unsigned long mode,
-				unsigned long __user *nmask,
+				const unsigned long __user *nmask,
 				unsigned long maxnode,
 				unsigned flags);
 asmlinkage long sys_get_mempolicy(int __user *policy,
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 78e1472933ea..727187f1155b 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1362,7 +1362,7 @@ static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode,
 }
 
 SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len,
-		unsigned long, mode, unsigned long __user *, nmask,
+		unsigned long, mode, const unsigned long __user *, nmask,
 		unsigned long, maxnode, unsigned, flags)
 {
 	nodemask_t nodes;