diff --git a/include/linux/compat.h b/include/linux/compat.h
index f4ebf96..f155319 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -196,7 +196,7 @@
 #define BITS_TO_COMPAT_LONGS(bits) \
 	(((bits)+BITS_PER_COMPAT_LONG-1)/BITS_PER_COMPAT_LONG)
 
-long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask,
+long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
 		       unsigned long bitmap_size);
 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
 		       unsigned long bitmap_size);