diff --git a/lib/gen_print.py b/lib/gen_print.py
index d65ed39..5f87343 100755
--- a/lib/gen_print.py
+++ b/lib/gen_print.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 r"""
 This module provides many print functions such as sprint_var, sprint_time, sprint_error, sprint_call_stack.