diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index da7ab48..ba2009b 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -940,6 +940,8 @@
 #define ext4_find_next_zero_bit		find_next_zero_bit_le
 #define ext4_find_next_bit		find_next_bit_le
 
+extern void ext4_set_bits(void *bm, int cur, int len);
+
 /*
  * Maximal mount counts between two filesystem checks
  */