diff --git a/src/gen/template-generator.js b/src/gen/template-generator.js
index 5645022..b78d59d 100644
--- a/src/gen/template-generator.js
+++ b/src/gen/template-generator.js
@@ -142,8 +142,7 @@ Definition of the TemplateGenerator class.
     */
     single: function( json, jst, format, cssInfo, opts, theme ) {
       this.opts.freezeBreaks && ( jst = freeze(jst) );
-      var eng = require( '../eng/' + ((opts.themeObj && opts.themeObj.engine) ||
-        opts.engine)  + '-generator' );
+      var eng = require( '../eng/' + theme.engine  + '-generator' );
       var result = eng( json, jst, format, cssInfo, opts, theme );
       this.opts.freezeBreaks && ( result = unfreeze(result) );
       return result;