diff --git a/resources/node_resource.inc b/resources/node_resource.inc
index 934b272..ba0cbfa 100644
--- a/resources/node_resource.inc
+++ b/resources/node_resource.inc
@@ -272,6 +272,16 @@ function _node_resource_update($nid, $node) {
     // Load the required includes for drupal_execute
     module_load_include('inc', 'node', 'node.pages');
 
+    // Make submission of node type optional.
+    if (empty($node['type'])) {
+      $node['type'] = $old_node->type;
+    }
+    // Check for type validity.
+    $node_types = node_type_get_types();
+    if (!array_key_exists($node['type'], $node_types)) {
+      return services_error(t('Node type @type does not exist.', array('@type' => $node_type)), 406);
+    }
+
     // Setup form_state.
     $form_state = array();
     $form_state['values'] = $node;
diff --git a/tests/functional/ServicesResourceNodeTests.test b/tests/functional/ServicesResourceNodeTests.test
index 344d345..4f5f36c 100644
--- a/tests/functional/ServicesResourceNodeTests.test
+++ b/tests/functional/ServicesResourceNodeTests.test
@@ -244,6 +244,78 @@ class ServicesResourceNodetests extends ServicesWebTestCase {
   }
 
   /**
+  * testing node_resource Update with missing node type
+  */
+  public function testEndpointResourceNodeUpdateMissingType() {
+    // Create and log in our privileged user.
+    $this->privilegedUser = $this->drupalCreateUser(array(
+      'administer services',
+      'bypass node access',
+    ));
+    $this->drupalLogin($this->privilegedUser);
+    $node = $this->drupalCreateNode();
+
+    $node_update = (array) $node;
+    $node_update['title'] = $this->randomName();
+    $node_update['body'][LANGUAGE_NONE][0]['value'] = $this->randomName();
+    unset($node_update['type']);
+
+    $responseArray = $this->servicesPut($this->endpoint->path . '/node/' . $node->nid, array('node' => $node_update));
+    // Load node not from cache.
+    $nodeAfterUpdate = node_load($responseArray['body']['nid'], NULL, TRUE);
+    $this->assertTrue(isset($nodeAfterUpdate->nid), t('Node was successfully updated'), 'NodeResource: Updated');
+    $this->assertEqual($nodeAfterUpdate->title, $node_update['title'], t('Title is the same'), 'NodeResource: Update');
+    $this->assertEqual($nodeAfterUpdate->body[LANGUAGE_NONE][0]['value'], $node_update['body'][LANGUAGE_NONE][0]['value'], t('Body is the same'), 'NodeResource: Update');
+  }
+
+  /**
+  * testing node_resource Update with empty node type
+  */
+  public function testEndpointResourceNodeUpdateEmptyType() {
+    // Create and log in our privileged user.
+    $this->privilegedUser = $this->drupalCreateUser(array(
+      'administer services',
+      'bypass node access',
+    ));
+    $this->drupalLogin($this->privilegedUser);
+    $node = $this->drupalCreateNode();
+
+    $node_update = (array) $node;
+    $node_update['title'] = $this->randomName();
+    $node_update['body'][LANGUAGE_NONE][0]['value'] = $this->randomName();
+    $node_update['type'] = '';
+
+    $responseArray = $this->servicesPut($this->endpoint->path . '/node/' . $node->nid, array('node' => $node_update));
+    // Load node not from cache.
+    $nodeAfterUpdate = node_load($responseArray['body']['nid'], NULL, TRUE);
+    $this->assertTrue(isset($nodeAfterUpdate->nid), t('Node was successfully updated'), 'NodeResource: Updated');
+    $this->assertEqual($nodeAfterUpdate->title, $node_update['title'], t('Title is the same'), 'NodeResource: Update');
+    $this->assertEqual($nodeAfterUpdate->body[LANGUAGE_NONE][0]['value'], $node_update['body'][LANGUAGE_NONE][0]['value'], t('Body is the same'), 'NodeResource: Update');
+  }
+
+  /**
+  * testing node_resource Update with invalid node type
+  */
+  public function testEndpointResourceNodeUpdateInvalidType() {
+    // Create and log in our privileged user.
+    $this->privilegedUser = $this->drupalCreateUser(array(
+      'administer services',
+      'bypass node access',
+    ));
+    $this->drupalLogin($this->privilegedUser);
+    $node = $this->drupalCreateNode();
+
+    $node_update = (array) $node;
+    $node_update['title'] = $this->randomName();
+    $node_update['body'][LANGUAGE_NONE][0]['value'] = $this->randomName();
+    $node_update['type'] = uniqid('', TRUE);
+
+    $responseArray = $this->servicesPut($this->endpoint->path . '/node/' . $node->nid, array('node' => $node_update));
+
+    $this->assertTrue($responseArray['code'] == 406, t('Node can not be updated if type is invalid'), 'NodeResource: UPDATE');
+  }
+
+  /**
   * testing node_resource Update fail with no permissions
   */
   public function testEndpointResourceNodeUpdatePermFail() {
@@ -447,4 +519,4 @@ class ServicesResourceNodeTaxonomytests extends ServicesResourceNodetests {
     taxonomy_term_save($term);
     return $term;
   }
-}
\ No newline at end of file
+}