diff --git a/raml-parser-2/src/test/java/org/raml/v2/api/TypeDeclarationValidationTestCase.java b/raml-parser-2/src/test/java/org/raml/v2/api/TypeDeclarationValidationTestCase.java
index 179a489c..67b13e4a 100644
--- a/raml-parser-2/src/test/java/org/raml/v2/api/TypeDeclarationValidationTestCase.java
+++ b/raml-parser-2/src/test/java/org/raml/v2/api/TypeDeclarationValidationTestCase.java
@@ -59,4 +59,27 @@ private void arrayValidation(RamlModelResult ramlModelResult)
         assertFalse(validationResults.isEmpty());
         assertEquals(validationResults.get(0).getMessage(), "Invalid type String, expected Float");
     }
+
+    @Test
+    public void discriminatorValidation()
+    {
+        File input = new File("src/test/resources/org/raml/v2/api/v10/validation/discriminator-validation.raml");
+        assertTrue(input.isFile());
+        RamlModelResult ramlModelResult = new RamlModelBuilder().buildApi(input);
+
+        subTypeValidation(ramlModelResult);
+    }
+
+    private void subTypeValidation(RamlModelResult ramlModelResult)
+    {
+        List<TypeDeclaration> typeDeclarations = ramlModelResult.getApiV10().resources().get(0).methods().get(0).body();
+
+        // valid
+        assertTrue(typeDeclarations.get(0).validate("{\"eventType\":\"foo\", \"bar\":\"\"}").isEmpty());
+        // invalid
+        assertFalse(typeDeclarations.get(0).validate("{\"eventType\":\"foo\"}").isEmpty());
+        // invalid
+        assertFalse(typeDeclarations.get(0).validate("{}").isEmpty());
+    }
+
 }
diff --git a/raml-parser-2/src/test/resources/org/raml/v2/api/v10/validation/discriminator-validation.raml b/raml-parser-2/src/test/resources/org/raml/v2/api/v10/validation/discriminator-validation.raml
new file mode 100644
index 00000000..a7a341dd
--- /dev/null
+++ b/raml-parser-2/src/test/resources/org/raml/v2/api/v10/validation/discriminator-validation.raml
@@ -0,0 +1,21 @@
+#%RAML 1.0
+title: test validate
+
+types:
+  event:
+    type: object
+    discriminator: eventType
+    properties:
+      eventType: string
+
+  fooEvent:
+    type: event
+    discriminatorValue: foo
+    properties:
+      bar: string
+
+/resource:
+   post:
+     body:
+       application/json:
+         type: fooEvent