diff --git a/tools/blockquote2div.py b/tools/blockquote2div.py
old mode 100644
new mode 100755
index a23109f076b77efe474ed58fceee748fdabb5fc1..bd3b52ba8eac77bdf9dcdaa69d44fab0c0c6431b
--- a/tools/blockquote2div.py
+++ b/tools/blockquote2div.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 """Pandoc filter to convert Blockquotes with attributes into Div
 with attributes.