diff --git a/app/models/conversion_host.rb b/app/models/conversion_host.rb
index d800b0d6df8..801ce7b75dd 100644
--- a/app/models/conversion_host.rb
+++ b/app/models/conversion_host.rb
@@ -332,7 +332,7 @@ def ansible_playbook(playbook, extra_vars = {}, miq_task_id = nil, auth_type = '
       raise MiqException::MiqInvalidCredentialsError, _("Unknown auth type: #{auth.authtype}")
     end
 
-    extra_vars.each { |k, v| command << " --extra-vars '#{k}=#{v}'" }
+    command << " --extra-vars '#{extra_vars.to_json}'"
 
     result = AwesomeSpawn.run(command)