diff --git a/lib/workflow.js b/lib/workflow.js
index 49930612..876f6bf6 100644
--- a/lib/workflow.js
+++ b/lib/workflow.js
@@ -17,7 +17,7 @@ module.exports = class Workflow {
         if (method !== 'constructor') {
           // Define a new function in the API for this plugin method, forcing
           // the binding to this to prevent any tampering.
-          this.api[method] = this.proxy(plugin, method).bind(this);
+          this.api[method] = this.proxy(plugin[method]).bind(this);
         }
       }
     }
@@ -37,10 +37,10 @@ module.exports = class Workflow {
     }) && this.filterFn(event);
   }
 
-  proxy(plugin, method) {
+  proxy(fn) {
     return (...args) => {
       // Push new function on the stack that calls the plugin method with a context.
-      this.stack.push(context => plugin[method](context, ...args));
+      this.stack.push(context => fn(context, ...args));
 
       // Return the API to allow methods to be chained.
       return this.api;