diff --git a/tools/closure.py b/tools/closure.py
index ab60be7eb0..03edbc351d 100644
--- a/tools/closure.py
+++ b/tools/closure.py
@@ -7,16 +7,14 @@ if not os.path.exists(path):
     raise Exception("No closure-compiler.jar at %s; read README.txt!" % path)
 
 def minimize(code):
-    ntf = tempfile.NamedTemporaryFile(delete=False)
+    ntf = tempfile.NamedTemporaryFile()
     ntf.write(code)
     ntf.flush()
 
-    ntf2 = tempfile.NamedTemporaryFile(delete=False)
-    ntf.close()
-    ntf2.close()
+    ntf2 = tempfile.NamedTemporaryFile()
 
     os.system("java -jar %s --js %s --js_output_file %s" % (path, ntf.name, ntf2.name))
     data = open(ntf2.name).read()
-    os.unlink(ntf.name)
-    os.unlink(ntf2.name)
+    ntf.close()
+    ntf2.close()
     return data