diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index bfef0be279dd30ce81570fd0be39617cbf16849c..b0881a0ed322a98253b5a14503002f1bd50a772f 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -711,7 +711,7 @@ asmlinkage long sys_keyctl(int cmd, unsigned long arg2, unsigned long arg3,
 
 asmlinkage long sys_ioprio_set(int which, int who, int ioprio);
 asmlinkage long sys_ioprio_get(int which, int who);
-asmlinkage long sys_set_mempolicy(int mode, unsigned long __user *nmask,
+asmlinkage long sys_set_mempolicy(int mode, const unsigned long __user *nmask,
 				unsigned long maxnode);
 asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode,
 				const unsigned long __user *from,
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 727187f1155be3d36a1959997b3a52d95bf5b509..b09586d8316b89339b7417dbbf591979c84294a2 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1383,7 +1383,7 @@ SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len,
 }
 
 /* Set the process memory policy */
-SYSCALL_DEFINE3(set_mempolicy, int, mode, unsigned long __user *, nmask,
+SYSCALL_DEFINE3(set_mempolicy, int, mode, const unsigned long __user *, nmask,
 		unsigned long, maxnode)
 {
 	int err;