diff --git a/Tests/Command/TranslationPushCommandTest.php b/Tests/Command/TranslationPushCommandTest.php
index b174c5c0..2c7f576c 100644
--- a/Tests/Command/TranslationPushCommandTest.php
+++ b/Tests/Command/TranslationPushCommandTest.php
@@ -89,6 +89,52 @@ public function testPushNewMessages()
         $this->assertStringContainsString('[OK] New local translations has been sent to "null" (for "en, fr" locale(s), and "messages" domain(s)).', trim($tester->getDisplay()));
     }
 
+    public function testPushNewIntlIcuMessages()
+    {
+        $arrayLoader = new ArrayLoader();
+        $xliffLoader = new XliffFileLoader();
+        $locales = ['en', 'fr'];
+        $domains = ['messages'];
+
+        // Simulate existing messages on Provider
+        $providerReadTranslatorBag = new TranslatorBag();
+        $providerReadTranslatorBag->addCatalogue($arrayLoader->load(['note' => 'NOTE'], 'en'));
+        $providerReadTranslatorBag->addCatalogue($arrayLoader->load(['note' => 'NOTE'], 'fr'));
+
+        $provider = $this->createMock(ProviderInterface::class);
+        $provider->expects($this->once())
+            ->method('read')
+            ->with($domains, $locales)
+            ->willReturn($providerReadTranslatorBag);
+
+        // Create local files, with a new message
+        $filenameEn = $this->createFile([
+            'note' => 'NOTE',
+            'new.foo' => 'newFooIntlIcu',
+        ], 'en', 'messages+intl-icu.%locale%.xlf');
+        $filenameFr = $this->createFile([
+            'note' => 'NOTE',
+            'new.foo' => 'nouveauFooIntlIcu',
+        ], 'fr', 'messages+intl-icu.%locale%.xlf');
+        $localTranslatorBag = new TranslatorBag();
+        $localTranslatorBag->addCatalogue($xliffLoader->load($filenameEn, 'en'));
+        $localTranslatorBag->addCatalogue($xliffLoader->load($filenameFr, 'fr'));
+
+        $provider->expects($this->once())
+            ->method('write')
+            ->with($localTranslatorBag->diff($providerReadTranslatorBag));
+
+        $provider->expects($this->once())
+            ->method('__toString')
+            ->willReturn('null://default');
+
+        $tester = $this->createCommandTester($provider, $locales, $domains);
+
+        $tester->execute(['--locales' => ['en', 'fr'], '--domains' => ['messages']]);
+
+        $this->assertStringContainsString('[OK] New local translations has been sent to "null" (for "en, fr" locale(s), and "messages" domain(s)).', trim($tester->getDisplay()));
+    }
+
     public function testPushForceMessages()
     {
         $xliffLoader = new XliffFileLoader();
diff --git a/Tests/TranslatorBagTest.php b/Tests/TranslatorBagTest.php
index 58b8fa02..102f2e44 100644
--- a/Tests/TranslatorBagTest.php
+++ b/Tests/TranslatorBagTest.php
@@ -66,6 +66,34 @@ public function testDiff()
         ], $this->getAllMessagesFromTranslatorBag($bagResult));
     }
 
+    public function testDiffWithIntlDomain()
+    {
+        $catalogueA = new MessageCatalogue('en', [
+            'domain1+intl-icu' => ['foo' => 'foo', 'bar' => 'bar'],
+            'domain2' => ['baz' => 'baz', 'qux' => 'qux'],
+        ]);
+
+        $bagA = new TranslatorBag();
+        $bagA->addCatalogue($catalogueA);
+
+        $catalogueB = new MessageCatalogue('en', [
+            'domain1' => ['foo' => 'foo'],
+            'domain2' => ['baz' => 'baz', 'corge' => 'corge'],
+        ]);
+
+        $bagB = new TranslatorBag();
+        $bagB->addCatalogue($catalogueB);
+
+        $bagResult = $bagA->diff($bagB);
+
+        $this->assertEquals([
+            'en' => [
+                'domain1' => ['bar' => 'bar'],
+                'domain2' => ['qux' => 'qux'],
+            ],
+        ], $this->getAllMessagesFromTranslatorBag($bagResult));
+    }
+
     public function testIntersect()
     {
         $catalogueA = new MessageCatalogue('en', ['domain1' => ['foo' => 'foo', 'bar' => 'bar'], 'domain2' => ['baz' => 'baz', 'qux' => 'qux']]);
diff --git a/TranslatorBag.php b/TranslatorBag.php
index 555a9e81..6a4df3c3 100644
--- a/TranslatorBag.php
+++ b/TranslatorBag.php
@@ -70,7 +70,7 @@ public function diff(TranslatorBagInterface $diffBag): self
             $operation->moveMessagesToIntlDomainsIfPossible(AbstractOperation::NEW_BATCH);
             $newCatalogue = new MessageCatalogue($locale);
 
-            foreach ($operation->getDomains() as $domain) {
+            foreach ($catalogue->getDomains() as $domain) {
                 $newCatalogue->add($operation->getNewMessages($domain), $domain);
             }