diff --git a/plugins/provisioners/docker/config.rb b/plugins/provisioners/docker/config.rb
index 362e442db..078804974 100644
--- a/plugins/provisioners/docker/config.rb
+++ b/plugins/provisioners/docker/config.rb
@@ -22,7 +22,7 @@ module VagrantPlugins
 
       def run(name, **options)
         params = options.dup
-        params[:image] = name
+        params[:image] ||= name
 
         # TODO: Validate provided parameters before assignment
         @containers[name.to_s] = params