diff --git a/pdfminer/pdfdevice.py b/pdfminer/pdfdevice.py
index 9321362..9435101 100644
--- a/pdfminer/pdfdevice.py
+++ b/pdfminer/pdfdevice.py
@@ -15,6 +15,12 @@ class PDFDevice(object):
     def __repr__(self):
         return '<PDFDevice>'
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.close()
+
     def close(self):
         return