diff --git a/compiler/tests/org/jetbrains/kotlin/test/util/DescriptorValidator.java b/compiler/tests/org/jetbrains/kotlin/test/util/DescriptorValidator.java
index 19d84ede213..eec7844a39f 100644
--- a/compiler/tests/org/jetbrains/kotlin/test/util/DescriptorValidator.java
+++ b/compiler/tests/org/jetbrains/kotlin/test/util/DescriptorValidator.java
@@ -263,6 +263,11 @@ public class DescriptorValidator {
                 }
             }
 
+            ClassDescriptor defaultObjectDescriptor = descriptor.getDefaultObjectDescriptor();
+            if (defaultObjectDescriptor != null && defaultObjectDescriptor.getKind() != ClassKind.CLASS_OBJECT) {
+                report(collector, defaultObjectDescriptor, "Default object should be of kind " + ClassKind.CLASS_OBJECT);
+            }
+
             return true;
         }