diff --git a/util/compare_gnu_result.py b/util/compare_gnu_result.py
index 704951863..0ea55210d 100755
--- a/util/compare_gnu_result.py
+++ b/util/compare_gnu_result.py
@@ -1,4 +1,4 @@
-#! /usr/bin/python
+#!/usr/bin/env python3
 
 """
 Compare the current results to the last results gathered from the main branch to highlight
diff --git a/util/size-experiment.py b/util/size-experiment.py
index 3a321c1b2..2b1ec0fce 100644
--- a/util/size-experiment.py
+++ b/util/size-experiment.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 # spell-checker:ignore debuginfo
 import subprocess
 from itertools import product