diff --git a/Lib/formatter.py b/Lib/formatter.py
index 769bd6a90a5..cc2f4ad18b1 100644
--- a/Lib/formatter.py
+++ b/Lib/formatter.py
@@ -436,11 +436,15 @@ def test(file = None):
         fp = open(sys.argv[1])
     else:
         fp = sys.stdin
-    for line in fp:
-        if line == '\n':
-            f.end_paragraph(1)
-        else:
-            f.add_flowing_data(line)
+    try:
+        for line in fp:
+            if line == '\n':
+                f.end_paragraph(1)
+            else:
+                f.add_flowing_data(line)
+    finally:
+        if fp is not sys.stdin:
+            fp.close()
     f.end_paragraph(0)