diff --git a/clang-tools-extra/clang-tidy/add_new_check.py b/clang-tools-extra/clang-tidy/add_new_check.py
--- a/clang-tools-extra/clang-tidy/add_new_check.py
+++ b/clang-tools-extra/clang-tidy/add_new_check.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 #===- add_new_check.py - clang-tidy check generator ---------*- python -*--===#
 #
@@ -301,7 +301,7 @@
 
 
 def get_actual_filename(dirname, filename):
-  if not os.path.isdir(dirname): 
+  if not os.path.isdir(dirname):
     return ''
   name = os.path.join(dirname, filename)
   if (os.path.isfile(name)):
diff --git a/clang-tools-extra/clang-tidy/rename_check.py b/clang-tools-extra/clang-tidy/rename_check.py
--- a/clang-tools-extra/clang-tidy/rename_check.py
+++ b/clang-tools-extra/clang-tidy/rename_check.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 #===- rename_check.py - clang-tidy check renamer ------------*- python -*--===#
 #