diff --git a/src/validation/jsonType.ts b/src/validation/jsonType.ts
index 9df64a31..42c157f8 100644
--- a/src/validation/jsonType.ts
+++ b/src/validation/jsonType.ts
@@ -18,10 +18,7 @@ function isJsonObject(value: unknown): value is JsonObject {
 }
 
 function isPlainObject(value: unknown): value is object {
-    return typeof value === 'object' // exclude primitives
-        && value !== null // exclude nulls
-        && value.constructor === Object // exclude instances (Array, DOM, ...)
-        && Object.prototype.toString.call(value) === '[object Object]'; // exclude build-in like Math
+    return Object.prototype.toString.call(value) === '[object Object]';
 }
 
 type JsonObjectDefinition = {
diff --git a/test/validation/jsonType.test.ts b/test/validation/jsonType.test.ts
index a7168db5..6989d1ba 100644
--- a/test/validation/jsonType.test.ts
+++ b/test/validation/jsonType.test.ts
@@ -68,6 +68,7 @@ describe('A JSON object type', () => {
         [['foo', 'bar'], false],
         [{foo: 'bar'}, true],
         [new Object('foo'), false],
+        [new Object(), true],
     ])('should determine whether the type of a given value is valid', (value: any, expected: boolean) => {
         expect(new JsonObjectType().isValidType(value)).toBe(expected);
     });