diff --git a/plugins/guests/linux/cap/public_key.rb b/plugins/guests/linux/cap/public_key.rb
index 92a718281..3d57f5596 100644
--- a/plugins/guests/linux/cap/public_key.rb
+++ b/plugins/guests/linux/cap/public_key.rb
@@ -54,6 +54,7 @@ module VagrantPlugins
             if test -f ~/.ssh/authorized_keys; then
               grep -v -x -f '#{remote_path}' ~/.ssh/authorized_keys > ~/.ssh/authorized_keys.tmp
               mv ~/.ssh/authorized_keys.tmp ~/.ssh/authorized_keys
+              chmod 0600 ~/.ssh/authorized_keys
             fi
 
             rm -f '#{remote_path}'