diff --git a/tools/generate-wire.py b/tools/generate-wire.py
index 13dc7dd90..c203f6dee 100755
--- a/tools/generate-wire.py
+++ b/tools/generate-wire.py
@@ -1,4 +1,4 @@
-#! /usr/bin/python3
+#! /usr/bin/env python3
 # Read from stdin, spit out C header or body.
 
 import argparse