diff --git a/crm/src/Plugin/collect/Processor/ContactMatcher.php b/crm/src/Plugin/collect/Processor/ContactMatcher.php
index cdf714b..0d02f17 100644
--- a/crm/src/Plugin/collect/Processor/ContactMatcher.php
+++ b/crm/src/Plugin/collect/Processor/ContactMatcher.php
@@ -85,7 +85,7 @@ class ContactMatcher extends ProcessorBase {
 
     // Update the existing contact or save a new one.
     if (!empty($existing_contact)) {
-      $this->updateContact($existing_contact, $contact_values);
+      $existing_contact = $this->updateContact($existing_contact, $template_contact, array_keys($contact_values));
     }
     else {
       $existing_contact = $this->saveNewContact($template_contact);
@@ -174,8 +174,8 @@ class ContactMatcher extends ProcessorBase {
     /** @var \Drupal\crm_core_match\Matcher\MatcherConfigInterface $matcher */
     $matcher = $this->entityManager->getStorage('crm_core_match')->load($this->getConfigurationItem('matcher'));
     if ($matches = $matcher->match($template_contact)) {
-      return $this->entityManager->getStorage('crm_core_contact')
-        ->load(reset($matches));
+      // @todo: Handle the case if there are multiple matches.
+      return $this->entityManager->getStorage('crm_core_contact')->load(reset($matches));
     }
 
     return NULL;
@@ -186,26 +186,49 @@ class ContactMatcher extends ProcessorBase {
    *
    * @param \Drupal\crm_core_contact\ContactInterface $existing_contact
    *   The existing contact.
-   * @param array $new_values
-   *   Associative array of new values for some fields, keyed by field names.
+   * @param \Drupal\crm_core_contact\ContactInterface $template_contact
+   *   The template contact containing new values.
+   * @param array $updated_fields
+   *   Associative array of updated fields.
+   *
+   * @return \Drupal\crm_core_contact\ContactInterface
+   *   The updated contact.
    */
-  protected function updateContact(ContactInterface $existing_contact, array $new_values) {
-    $has_changed = FALSE;
-    foreach ($new_values as $field_name => $value) {
-      $current_value = $existing_contact->get($field_name)->getValue();
-      // Append user URI if unique.
+  protected function updateContact(ContactInterface $existing_contact, ContactInterface $template_contact, array $updated_fields) {
+    foreach ($updated_fields as $field_name) {
       if ($field_name == 'user_uri') {
-        $value = array_unique(array_merge($current_value, $value), SORT_REGULAR);
-      }
-      // Only change field value and trigger new revision if value has changed.
-      if ($value != $current_value) {
-        $existing_contact->set($field_name, $value);
-        $has_changed = TRUE;
+        $this->updateUserUri($existing_contact, $template_contact);
+        continue;
       }
+      $existing_contact->{$field_name} = $template_contact->get($field_name);
     }
-    if ($has_changed) {
-      $existing_contact->setNewRevision();
-      $existing_contact->save();
+
+    $existing_contact->save();
+
+    return $existing_contact;
+  }
+
+  /**
+   * Updates a user URI field of an existing contact.
+   *
+   * @param \Drupal\crm_core_contact\ContactInterface $existing_contact
+   *   The existing contact.
+   * @param \Drupal\crm_core_contact\ContactInterface $template_contact
+   *   The template contact.
+   */
+  protected function updateUserUri(ContactInterface $existing_contact, ContactInterface $template_contact) {
+    // Get existing user URIs.
+    $user_uris = $existing_contact->get('user_uri');
+    $matched_uris = $template_contact->get('user_uri');
+
+    // Loop over matched and existing user URIs and update existing URIs with
+    // new ones.
+    foreach ($matched_uris as $matched_uri) {
+      foreach ($user_uris as $user_uri) {
+        if ($matched_uri->getValue() != $user_uri->getValue()) {
+          $user_uris->appendItem($matched_uri);
+        }
+      }
     }
   }
 
diff --git a/crm/tests/src/Kernel/MailContactMatcherTest.php b/crm/tests/src/Kernel/MailContactMatcherTest.php
index ae44cf5..99066d3 100644
--- a/crm/tests/src/Kernel/MailContactMatcherTest.php
+++ b/crm/tests/src/Kernel/MailContactMatcherTest.php
@@ -96,6 +96,11 @@ class MailContactMatcherTest extends KernelTestBase {
 
     // Assert returned contact has a correct name.
     $this->assertEquals($contact->get('name')->given, 'Nancy');
+
+    // Assert there are no new contacts created after repeating the processing.
+    $context = [];
+    $mail_contact_matcher->process($collect_type_data_provider->getTypedData($container), $context);
+    $this->assertEquals(1, count($context['contacts']['default']), 'No new contacts.');
   }
 
 }