diff --git a/core/modules/migrate_drupal/src/Annotation/MigrateField.php b/core/modules/migrate_drupal/src/Annotation/MigrateField.php
index 8225b71..ab2c033 100644
--- a/core/modules/migrate_drupal/src/Annotation/MigrateField.php
+++ b/core/modules/migrate_drupal/src/Annotation/MigrateField.php
@@ -55,7 +55,7 @@ public function __construct($values) {
    * Identifies the system providing the data the field plugin will read.
    *
    * The source_module is expected to be the name of a Drupal module that must
-   * must be installed in the source database.
+   * be installed in the source database.
    *
    * @var string
    */