diff --git a/doc/api_methods/UpdateList.md b/doc/api_methods/UpdateList.md
index 119347dc66..2010933cde 100644
--- a/doc/api_methods/UpdateList.md
+++ b/doc/api_methods/UpdateList.md
@@ -4,7 +4,7 @@
 
 ## `array updateList(array $list)`
 
-This method provides functionality for updating a list name or description.
+This method provides functionality for updating a list name or description. Only lists of type 'default' are supported.
 
 It returns the updated list. See [Get Lists](GetLists.md) for a list data structure description.
 
@@ -29,10 +29,11 @@ An exception of base class `\Exception` can be thrown when something unexpected
 
 Codes description:
 
-| Code | Description                                  |
-| ---- | -------------------------------------------- |
-| 5    | The list was not found by id                 |
-| 14   | Missing list name                            |
-| 15   | Trying to use a list that is already used    |
-| 18   | Missing list id                              |
-| 19   | The list couldn’t be updated in the database |
+| Code | Description                                     |
+| ---- | ----------------------------------------------- |
+| 5    | The list was not found by id                    |
+| 14   | Missing list name                               |
+| 15   | Trying to use a list name that is already used  |
+| 18   | Missing list id                                 |
+| 19   | The list couldn’t be updated in the database    |
+| 23   | Only lists of the type 'default' can be updated |
diff --git a/mailpoet/lib/API/MP/v1/APIException.php b/mailpoet/lib/API/MP/v1/APIException.php
index 7f51e2c659..90b16e4500 100644
--- a/mailpoet/lib/API/MP/v1/APIException.php
+++ b/mailpoet/lib/API/MP/v1/APIException.php
@@ -23,4 +23,5 @@ class APIException extends \Exception {
   const LIST_USED_IN_EMAIL = 20;
   const LIST_USED_IN_FORM = 21;
   const FAILED_TO_DELETE_LIST = 22;
+  const LIST_TYPE_IS_NOT_SUPPORTED = 23;
 }
diff --git a/mailpoet/lib/API/MP/v1/Segments.php b/mailpoet/lib/API/MP/v1/Segments.php
index c5f16bc715..8c2aaafd34 100644
--- a/mailpoet/lib/API/MP/v1/Segments.php
+++ b/mailpoet/lib/API/MP/v1/Segments.php
@@ -60,6 +60,9 @@ class Segments {
     // secondly validation on list name
     $this->validateSegmentName($data);
 
+    // update is supported only for default segment type
+    $this->validateSegmentType((string)$data['id']);
+
     try {
       $segment = $this->segmentsRepository->createOrUpdate(
         $data['name'],
@@ -160,6 +163,21 @@ class Segments {
     }
   }
 
+  private function validateSegmentType(string $segmentId): void {
+    $segment = $this->segmentsRepository->findOneById($segmentId);
+    if ($segment && $segment->getType() !== SegmentEntity::TYPE_DEFAULT) {
+      throw new APIException(
+        str_replace(
+          '%1$s',
+          "'" . $segment->getType() . "'",
+          // translators: %1$s is an invalid segment type.
+          __('List of the type %1$s is not supported for this action.', 'mailpoet')
+        ),
+        APIException::LIST_TYPE_IS_NOT_SUPPORTED
+      );
+    }
+  }
+
   /**
    * @param SegmentEntity $segment
    * @return array
diff --git a/mailpoet/tests/integration/API/MP/SegmentsTest.php b/mailpoet/tests/integration/API/MP/SegmentsTest.php
index 0d715761a3..f551737047 100644
--- a/mailpoet/tests/integration/API/MP/SegmentsTest.php
+++ b/mailpoet/tests/integration/API/MP/SegmentsTest.php
@@ -168,6 +168,18 @@ class SegmentsTest extends \MailPoetTest {
     expect($result['description'])->equals($data['description']);
   }
 
+  public function testItDoesNotAllowUpdateWPSegment(): void {
+    $wpSegment = $this->segmentsRepository->getWPUsersSegment();
+    $this->assertInstanceOf(SegmentEntity::class, $wpSegment);
+    try {
+      $this->getApi()->updateList(['id' => $wpSegment->getId(), 'name' => 'Test']);
+      $this->fail('WP list cannot be updated.');
+    } catch (\Exception $e) {
+      expect($e->getMessage())->equals('List of the type \'' . $wpSegment->getType() . '\' is not supported for this action.');
+      expect($e->getCode())->equals(APIException::LIST_TYPE_IS_NOT_SUPPORTED);
+    }
+  }
+
   public function testItRequiresIdToDeleteList(): void {
     try {
       $this->getApi()->deleteList('');