diff --git a/setup.py b/setup.py
index 1275f4fd1..0f4d5fb38 100644
--- a/setup.py
+++ b/setup.py
@@ -100,7 +100,8 @@ def _lib_include(root):
 
 
 def _read(file):
-    return open(file, 'rb').read()
+    with open(file, 'rb') as fp:
+        return fp.read()
 
 
 try: