diff --git a/core/modules/node/migration_templates/d6_node_translation.yml b/core/modules/node/migration_templates/d6_node_translation.yml
index b4a2402..a1af690 100644
--- a/core/modules/node/migration_templates/d6_node_translation.yml
+++ b/core/modules/node/migration_templates/d6_node_translation.yml
@@ -29,6 +29,7 @@ process:
   revision_uid: revision_uid
   revision_log: log
   revision_timestamp: timestamp
+  content_translation_source: source_langcode
 
 #  unmapped d6 fields.
 #  translate
diff --git a/core/modules/node/src/Plugin/migrate/source/d6/Node.php b/core/modules/node/src/Plugin/migrate/source/d6/Node.php
index 8686415..f849bef 100644
--- a/core/modules/node/src/Plugin/migrate/source/d6/Node.php
+++ b/core/modules/node/src/Plugin/migrate/source/d6/Node.php
@@ -40,6 +40,7 @@ class Node extends DrupalSqlBase {
   public function query() {
     $query = $this->select('node_revisions', 'nr');
     $query->innerJoin('node', 'n', static::JOIN);
+    $query->leftJoin('node', 'nt', 'n.tnid = nt.nid');
     $this->handleTranslations($query);
 
     $query->fields('n', array(
@@ -67,6 +68,7 @@ public function query() {
       ));
     $query->addField('n', 'uid', 'node_uid');
     $query->addField('nr', 'uid', 'revision_uid');
+    $query->addField('nt', 'language', 'source_langcode');
 
     if (isset($this->configuration['node_type'])) {
       $query->condition('n.type', $this->configuration['node_type']);
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php
index 122199f..97f41fe 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php
@@ -28,7 +28,12 @@ protected function setUp() {
     parent::setUp();
     $this->setUpMigratedFiles();
     $this->installSchema('file', ['file_usage']);
-    $this->executeMigrations(['language', 'd6_node', 'd6_node_translation']);
+    $this->executeMigrations([
+      'language',
+      'd6_language_content_settings',
+      'd6_node',
+      'd6_node_translation',
+    ]);
   }
 
   /**
@@ -96,6 +101,10 @@ public function testNode() {
     $this->assertIdentical('The Real McCoy', $node->title->value);
     $this->assertTrue($node->hasTranslation('fr'), "Node 10 has french translation");
 
+    // Test that content_translation_source is set.
+    $manager = $this->container->get('content_translation.manager');
+    $this->assertIdentical('en', $manager->getTranslationMetadata($node->getTranslation('fr'))->getSource());
+
     // Node 11 is a translation of node 10, and should not be imported separately.
     $this->assertNull(Node::load(11), "Node 11 doesn't exist in D8, it was a translation");