diff --git a/math.h b/math.h
deleted file mode 100644
index 0c161045..00000000
--- a/math.h
+++ /dev/null
@@ -1,33 +0,0 @@
-
-/*
- * Copyright (C) 2012 FUJITSU LIMITED.  All rights reserved.
- * Written by Miao Xie <miaox@cn.fujitsu.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#ifndef __BTRFS_MATH_H
-#define __BTRFS_MATH_H
-
-static inline u64 div_factor(u64 num, int factor)
-{
-	if (factor == 10)
-		return num;
-	num *= factor;
-	num /= 10;
-	return num;
-}
-
-#endif
diff --git a/utils.h b/utils.h
index 34fd5e4e..2480a212 100644
--- a/utils.h
+++ b/utils.h
@@ -190,6 +190,15 @@ static inline int count_digits(u64 num)
 	return ret;
 }
 
+static inline u64 div_factor(u64 num, int factor)
+{
+	if (factor == 10)
+		return num;
+	num *= factor;
+	num /= 10;
+	return num;
+}
+
 int btrfs_tree_search2_ioctl_supported(int fd);
 
 #endif
diff --git a/volumes.c b/volumes.c
index a988cdbc..5ba5db5d 100644
--- a/volumes.c
+++ b/volumes.c
@@ -29,7 +29,7 @@
 #include "transaction.h"
 #include "print-tree.h"
 #include "volumes.h"
-#include "math.h"
+#include "utils.h"
 
 struct stripe {
 	struct btrfs_device *dev;