--- a/Lib/distutils/command/bdist_wininst.py
+++ b/Lib/distutils/command/bdist_wininst.py
@@ -98,6 +98,7 @@
         install = self.reinitialize_command('install')
         install.root = self.bdist_dir
         install.skip_build = self.skip_build
+        install.warn_dir = 0
 
         install_lib = self.reinitialize_command('install_lib')
         # we do not want to include pyc or pyo files