diff --git a/tools/internal_test.py b/tools/internal_test.py
index 8e03610..47d236e 100755
--- a/tools/internal_test.py
+++ b/tools/internal_test.py
@@ -340,7 +340,7 @@
 def execute(cmd, archive, env=None):
   if cmd == []:
     return
-  
+
   assert(cmd[0].endswith('.py'))
   cmd = [sys.executable] + cmd