diff --git a/jieba/__init__.py b/jieba/__init__.py
index 9cd2c6d..4ce7e17 100644
--- a/jieba/__init__.py
+++ b/jieba/__init__.py
@@ -81,7 +81,8 @@ def initialize(*args):
 			min_freq = min(FREQ.itervalues())
 			print >> sys.stderr, "dumping model to file cache " + cache_file
 			tmp_suffix = "."+str(random.random())
-			marshal.dump((trie,FREQ,total,min_freq),open(cache_file+tmp_suffix,'wb'))
+			with open(cache_file+tmp_suffix,'wb') as temp_cache_file:
+				marshal.dump((trie,FREQ,total,min_freq),temp_cache_file)
 			if os.name=='nt':
 				import shutil
 				replace_file = shutil.move