diff --git a/tools/make-frozen.py b/tools/make-frozen.py
index 1051b52..06ee7a3 100755
--- a/tools/make-frozen.py
+++ b/tools/make-frozen.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Create frozen modules structure for MicroPython.
 #