diff --git a/src/Model/Common/Address.php b/src/Model/Common/Address.php
index 938547df16..52274f9ead 100644
--- a/src/Model/Common/Address.php
+++ b/src/Model/Common/Address.php
@@ -55,6 +55,8 @@
  * @method Address setAdditionalAddressInfo(string $additionalAddressInfo = null)
  * @method string getFax()
  * @method Address setFax(string $fax = null)
+ * @method string getExternalId()
+ * @method Address setExternalId(string $externalId = null)
  */
 class Address extends JsonObject
 {
@@ -84,6 +86,7 @@ public function fieldDefinitions()
             'email' => [self::TYPE => 'string'],
             'additionalAddressInfo' => [self::TYPE => 'string'],
             'fax' => [static::TYPE => 'string'],
+            'externalId' => [static::TYPE => 'string'],
         ];
     }
 }
diff --git a/tests/fixtures/models.yaml b/tests/fixtures/models.yaml
index 2074a60d79..c38628219d 100644
--- a/tests/fixtures/models.yaml
+++ b/tests/fixtures/models.yaml
@@ -211,6 +211,7 @@ address:
     - email
     - additionalAddressInfo
     - fax
+    - externalId
 discountedPrice:
   domain: common
   model: discountedPrice
diff --git a/tests/integration/Customer/CustomerUpdateRequestTest.php b/tests/integration/Customer/CustomerUpdateRequestTest.php
index a9bb18496e..096ba2ce54 100644
--- a/tests/integration/Customer/CustomerUpdateRequestTest.php
+++ b/tests/integration/Customer/CustomerUpdateRequestTest.php
@@ -212,6 +212,28 @@ public function testAddress()
         $this->assertCount(0, $customer->getAddresses());
     }
 
+    public function testAddressExternalId()
+    {
+        $draft = $this->getDraft('external-address-id');
+        $customer = $this->createCustomer($draft);
+
+        $externalId = uniqid();
+        $address = Address::of()
+            ->setCountry('DE')
+            ->setFirstName($this->getTestRun() . '-firstName')
+            ->setExternalId($externalId);
+
+        $request = CustomerUpdateRequest::ofIdAndVersion($customer->getId(), $customer->getVersion())
+            ->addAction(CustomerAddAddressAction::ofAddress($address))
+        ;
+        $response = $request->executeWithClient($this->getClient());
+        $customer = $request->mapResponse($response);
+        $this->deleteRequest->setVersion($customer->getVersion());
+
+        $this->assertCount(1, $customer->getAddresses());
+        $this->assertSame($externalId, $customer->getAddresses()->current()->getExternalId());
+    }
+
     public function testDefaultShippingAddress()
     {
         $draft = $this->getDraft('title');