diff --git a/test/gflags_build.py.in b/test/gflags_build.py.in
index a8cba2b..559163e 100644
--- a/test/gflags_build.py.in
+++ b/test/gflags_build.py.in
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os
 import sys