diff --git a/patcher.js b/patcher.js
index e6c05d0..6286505 100644
--- a/patcher.js
+++ b/patcher.js
@@ -1,13 +1,14 @@
 function monkeyPatch(name, parentObj, patches) {
 	const injId   = Symbol()
-	const before  = (patches["before"]  === undefined) ? (...args)=>args     :  patches["before"];
-	const instead = (patches["instead"] === undefined) ? (res,...args)=>res(...args) : patches["instead"];
-	const after   = (patches["after"]   === undefined) ? (args, res)=>res    :   patches["after"];
+	const before  = patches["before"];
+	const instead = patches["instead"];
+	const after   = patches["after"];
 	const handler = {
 		apply: (target, thisArg, [ctx, args]) => {
-			before.apply(ctx, args);
-			res = instead(target.bind(ctx), args)
-			return after.apply(ctx, args.concat([res]));
+			if (before !== undefined) before.apply(ctx, args);
+			res = (patches["instead"] !== undefined) ? instead.apply(ctx, [target.bind(ctx), ...args]) : target.apply(ctx, [...args])
+			if (after === undefined) return res
+			return after.apply(ctx, [res].concat(args));
 		}
 	};
 	const prox = new Proxy(parentObj[name], handler);