diff --git a/plugins/provisioners/ansible/config/guest.rb b/plugins/provisioners/ansible/config/guest.rb
index 13d801ff8..8171277d6 100644
--- a/plugins/provisioners/ansible/config/guest.rb
+++ b/plugins/provisioners/ansible/config/guest.rb
@@ -19,7 +19,7 @@ module VagrantPlugins
           @install           = UNSET_VALUE
           @install_mode      = UNSET_VALUE
           @pip_args          = UNSET_VALUE
-          @pip_install_cmd   = UNSET_VALUE          
+          @pip_install_cmd   = ""
           @provisioning_path = UNSET_VALUE
           @tmp_path          = UNSET_VALUE
         end