diff --git a/DataFormats/FWLite/scripts/edmLumisInFiles.py b/DataFormats/FWLite/scripts/edmLumisInFiles.py
index c36b2c8f79ce0..1e537dbadbf66 100755
--- a/DataFormats/FWLite/scripts/edmLumisInFiles.py
+++ b/DataFormats/FWLite/scripts/edmLumisInFiles.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 from __future__ import print_function
 from FWCore.PythonUtilities.LumiList   import LumiList