diff --git a/src/JsonSchema/Constraints/TypeConstraint.php b/src/JsonSchema/Constraints/TypeConstraint.php
index 0ef32843..012dccbd 100644
--- a/src/JsonSchema/Constraints/TypeConstraint.php
+++ b/src/JsonSchema/Constraints/TypeConstraint.php
@@ -208,6 +208,10 @@ protected function validateType(&$value, $type)
         }
 
         if ('null' === $type) {
+            if ($coerce) {
+                $value = $this->toNull($value);
+            }
+
             return is_null($value);
         }
 
@@ -234,6 +238,22 @@ protected function toBoolean($value)
         return $value;
     }
 
+    /**
+     * Converts a value to null. For example, "" becomes null.
+     *
+     * @param $value The value to convert to null
+     *
+     * @return null|mixed
+     */
+    protected function toNull($value)
+    {
+        if ($value === '') {
+            return null;
+        }
+
+        return $value;
+    }
+
     /**
      * Converts a numeric string to a number. For example, "4" becomes 4.
      *
diff --git a/tests/Constraints/BasicTypesTest.php b/tests/Constraints/BasicTypesTest.php
index 7daa43ad..a9994850 100644
--- a/tests/Constraints/BasicTypesTest.php
+++ b/tests/Constraints/BasicTypesTest.php
@@ -86,6 +86,17 @@ public function getInvalidTests()
                   "additionalProperties":false
                 }'
             ),
+            array(
+                '{
+                  "null":""
+                }',
+                '{
+                  "type":"object",
+                  "properties": {
+                    "null":{"type":"null"}
+                  }
+                }'
+            ),
             array(
                 '{
                   "null":1
diff --git a/tests/Constraints/CoerciveTest.php b/tests/Constraints/CoerciveTest.php
index cb5c5518..6b97cb9f 100644
--- a/tests/Constraints/CoerciveTest.php
+++ b/tests/Constraints/CoerciveTest.php
@@ -50,7 +50,9 @@ public function testValidCoerceCases($input, $schema, $errors = array())
 
         $this->assertTrue(gettype($value->number) == 'string');
         $this->assertTrue(gettype($value->integer) == 'string');
+        $this->assertTrue(gettype($value->negativeInteger) == 'string');
         $this->assertTrue(gettype($value->boolean) == 'string');
+        $this->assertTrue(gettype($value->null) == 'string');
 
         $validator->validate($value, $schema, $checkMode);
 
@@ -58,21 +60,18 @@ public function testValidCoerceCases($input, $schema, $errors = array())
         $this->assertTrue(gettype($value->integer) == 'integer');
         $this->assertTrue(gettype($value->negativeInteger) == 'integer');
         $this->assertTrue(gettype($value->boolean) == 'boolean');
+        $this->assertTrue(gettype($value->null) == 'NULL');
 
         $this->assertTrue($value->number === 1.5);
         $this->assertTrue($value->integer === 1);
         $this->assertTrue($value->negativeInteger === -2);
         $this->assertTrue($value->boolean === true);
+        $this->assertTrue($value->null === null);
 
         $this->assertTrue(gettype($value->multitype1) == 'boolean');
         $this->assertTrue(gettype($value->multitype2) == 'double');
         $this->assertTrue(gettype($value->multitype3) == 'integer');
 
-        $this->assertTrue($value->number === 1.5);
-        $this->assertTrue($value->integer === 1);
-        $this->assertTrue($value->negativeInteger === -2);
-        $this->assertTrue($value->boolean === true);
-
         $this->assertTrue($validator->isValid(), print_r($validator->getErrors(), true));
     }
 
@@ -128,7 +127,7 @@ public function getValidCoerceTests()
                   "boolean":"true",
                   "object":{},
                   "array":[],
-                  "null":null,
+                  "null":"",
                   "any": "string",
                   "allOf": "1",
                   "multitype1": "false",