diff --git a/common/tools.py b/common/tools.py
index b6b2547..47a14b0 100644
--- a/common/tools.py
+++ b/common/tools.py
@@ -44,17 +44,7 @@ def log_call(command, stdin=None):
 
 
 def sed_i(file_path, pattern, subst):
-	from tempfile import mkstemp
-	from shutil import move
-	from os import close
-	import os
+	import fileinput
 	import re
-	temp_fd, temp_path = mkstemp()
-	mode = os.stat(file_path).st_mode
-	with open(temp_path, 'w') as new_file:
-		with open(file_path) as old_file:
-			for line in old_file:
-				new_file.write(re.sub(pattern, subst, line))
-	close(temp_fd)
-	os.chmod(temp_path, mode)
-	move(temp_path, file_path)
+	for line in fileinput.input(files=file_path, inplace=True):
+		print re.sub(pattern, subst, line),