diff --git a/lib/weak.js b/lib/weak.js
index a9fd76a..115a4fe 100644
--- a/lib/weak.js
+++ b/lib/weak.js
@@ -36,10 +36,11 @@ module.exports = function (memoize) {
 				!(options.dispose && extensions.dispose) && !(options.maxAge && extensions.maxAge) &&
 				!(options.max && extensions.max) && !(options.refCounter && extensions.refCounter)) {
 			return defineProperties(function (obj) {
-				var result;
-				if (resolve) obj = resolve(arguments)[0];
+				var result, args = arguments;
+				if (resolve) args = resolve(args);
+				obj = args[0];
 				if (map.has(obj)) return map.get(obj);
-				result = fn.call(this, obj);
+				result = fn.apply(this, args);
 				if (map.has(obj)) throw customError("Circular invocation", 'CIRCULAR_INVOCATION');
 				map.set(obj, result);
 				return result;