diff --git a/build/gen_def.py b/build/gen_def.py
index a2222d0..926b813 100755
--- a/build/gen_def.py
+++ b/build/gen_def.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # gen_def.py :  Generate the .DEF file for Windows builds
 #
diff --git a/build/check.py b/build/check.py
index 2dacb4c..c44eb5a 100755
--- a/build/check.py
+++ b/build/check.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # check.py :  Run all the test cases.
 #