diff --git a/tests/main.py b/tests/main.py
index 39717f6612..81e476448a 100755
--- a/tests/main.py
+++ b/tests/main.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 '''
 The main source for testlib. Ties together the default test runners and
 loaders.