diff --git a/src/plugins/plugin.ts b/src/plugins/plugin.ts
index 7b0a744c5..fb02c5638 100644
--- a/src/plugins/plugin.ts
+++ b/src/plugins/plugin.ts
@@ -77,8 +77,10 @@ function setIndex(args: any[], opts: any = {}, resolve?: Function, reject?: Func
   } else {
     // Otherwise, let's tack them on to the end of the argument list
     // which is 90% of cases
-    args.push(resolve);
-    args.push(reject);
+    if (!opts.sync) {
+      args.push(resolve);
+      args.push(reject);
+    }
   }
   return args;
 }