diff --git a/plugins/provisioners/ansible/config.rb b/plugins/provisioners/ansible/config.rb
index 6232d8ece..9c35f089e 100644
--- a/plugins/provisioners/ansible/config.rb
+++ b/plugins/provisioners/ansible/config.rb
@@ -32,7 +32,7 @@ module VagrantPlugins
         @start_at_task     = UNSET_VALUE
         @raw_arguments     = UNSET_VALUE
         @groups            = UNSET_VALUE
-        @host_key_checking = "true"
+        @host_key_checking = "false"
       end
 
       def finalize!
diff --git a/website/docs/source/v2/provisioning/ansible.html.md b/website/docs/source/v2/provisioning/ansible.html.md
index 4f2ff5185..6a841e0e9 100644
--- a/website/docs/source/v2/provisioning/ansible.html.md
+++ b/website/docs/source/v2/provisioning/ansible.html.md
@@ -192,7 +192,7 @@ by the sudo command.
 * `ansible.raw_arguments` can be set to an array of strings corresponding to a list of `ansible-playbook` arguments (e.g. `['--check', '-M /my/modules']`). It is an *unsafe wildcard* that can be used to apply Ansible options that are not (yet) supported by this Vagrant provisioner. Following precedence rules apply:
   * Any supported options (described above) will override conflicting `raw_arguments` value (e.g. `--tags` or `--start-at-task`)
   * Vagrant default user authentication can be overridden via `raw_arguments` (with custom values for `--user` and `--private-key`)
-* `ansible.host_key_checking` can be set to `false` which will disable host key checking and prevent `"FAILED: (25, 'Inappropriate ioctl for device')"` errors from being reported during provisioner runs.  The default value is `true`, which matches the default behavior of Ansible 1.2.1 and later.
+* `ansible.host_key_checking` can be set to `true` which will enable host key checking. As Vagrant 1.5, the default value is `false`, to avoid connection problems when creating new virtual machines.
 
 ## Tips and Tricks