diff --git a/wordcloud/wordcloud.py b/wordcloud/wordcloud.py
index 1622c039..b93fa6e5 100644
--- a/wordcloud/wordcloud.py
+++ b/wordcloud/wordcloud.py
@@ -32,7 +32,8 @@
 
 FILE = os.path.dirname(__file__)
 FONT_PATH = os.environ.get('FONT_PATH', os.path.join(FILE, 'DroidSansMono.ttf'))
-STOPWORDS = set(map(str.strip, open(os.path.join(FILE, 'stopwords')).readlines()))
+with open(os.path.join(FILE, 'stopwords')) as f:
+    STOPWORDS = set(map(str.strip, f.readlines()))
 
 
 class IntegralOccupancyMap(object):