diff --git a/src/JsonSchema/Constraints/UndefinedConstraint.php b/src/JsonSchema/Constraints/UndefinedConstraint.php
index be932293..62a5dcef 100644
--- a/src/JsonSchema/Constraints/UndefinedConstraint.php
+++ b/src/JsonSchema/Constraints/UndefinedConstraint.php
@@ -66,8 +66,7 @@ public function validateTypes(&$value, $schema = null, JsonPointer $path, $i = n
         }
 
         // check object
-        if (TypeCheck\LooseTypeCheck::isObject($value)) { // Fixes failing assoc tests for default values - currently investigating
-        //if ($this->getTypeCheck()->isObject($value)) {  // to find the root cause of this, noting all other assoc tests pass.
+        if ($this->getTypeCheck()->isObject($value)) {
             $this->checkObject(
                 $value,
                 isset($schema->properties) ? $this->factory->getSchemaStorage()->resolveRefSchema($schema->properties) : $schema,
diff --git a/tests/Constraints/DefaultPropertiesTest.php b/tests/Constraints/DefaultPropertiesTest.php
index fcebe893..7025070b 100644
--- a/tests/Constraints/DefaultPropertiesTest.php
+++ b/tests/Constraints/DefaultPropertiesTest.php
@@ -94,7 +94,7 @@ public function getValidTests()
     /**
      * @dataProvider getValidTests
      */
-    public function testValidCases($input, $schema, $expectOutput = null)
+    public function testValidCases($input, $schema, $expectOutput = null, $validator = null)
     {
         if (is_string($input)) {
             $inputDecoded = json_decode($input);
@@ -102,8 +102,10 @@ public function testValidCases($input, $schema, $expectOutput = null)
             $inputDecoded = $input;
         }
 
-        $checkMode = Constraint::CHECK_MODE_APPLY_DEFAULTS;
-        $validator = new Validator(new Factory(null, null, $checkMode));
+        if ($validator === null) {
+            $checkMode = Constraint::CHECK_MODE_APPLY_DEFAULTS;
+            $validator = new Validator(new Factory(null, null, $checkMode));
+        }
         $validator->coerce($inputDecoded, json_decode($schema));
 
         $this->assertTrue($validator->isValid(), print_r($validator->getErrors(), true));
@@ -119,6 +121,9 @@ public function testValidCases($input, $schema, $expectOutput = null)
     public function testValidCasesUsingAssoc($input, $schema, $expectOutput = null)
     {
         $input = json_decode($input, true);
-        self::testValidCases($input, $schema, $expectOutput);
+
+        $checkMode = Constraint::CHECK_MODE_APPLY_DEFAULTS | Constraint::CHECK_MODE_TYPE_CAST;
+        $validator = new Validator(new Factory(null, null, $checkMode));
+        self::testValidCases($input, $schema, $expectOutput, $validator);
     }
 }