diff --git a/test/test-build.js b/test/test-build.js
index 939f237af..f61d5e75e 100644
--- a/test/test-build.js
+++ b/test/test-build.js
@@ -961,6 +961,11 @@
 
         strictEqual(actual, false, '_.isEqual should ignore `callback` and `thisArg`: ' + basename);
 
+        _.each(['isArray', 'isBoolean', 'isDate', 'isFunction', 'isNumber', 'isRegExp', 'isString'], function(methodName) {
+          var proto = global[methodName.slice(2)].prototype;
+          strictEqual(lodash[methodName](Object.create(proto)), false, '_.' + methodName + ' returns `false` for subclassed values: ' + basename);
+        });
+
         equal(lodash.max('abc'), -Infinity, '_.max should return `-Infinity` for strings: ' + basename);
         equal(lodash.min('abc'), Infinity, '_.min should return `Infinity` for strings: ' + basename);