diff -u b/core/modules/migrate/src/Plugin/migrate/source/SourcePluginBase.php b/core/modules/migrate/src/Plugin/migrate/source/SourcePluginBase.php
--- b/core/modules/migrate/src/Plugin/migrate/source/SourcePluginBase.php
+++ b/core/modules/migrate/src/Plugin/migrate/source/SourcePluginBase.php
@@ -12,7 +12,6 @@
 use Drupal\migrate\Plugin\MigrateIdMapInterface;
 use Drupal\migrate\Plugin\MigrateSourceInterface;
 use Drupal\migrate\Row;
-use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSourceTrait;
 
 /**
  * The base class for source plugins.
@@ -117,10 +116,6 @@
  */
 abstract class SourcePluginBase extends PluginBase implements MigrateSourceInterface, RollbackAwareInterface {
 
-  use DrupalSourceTrait {
-    getSourceModule as drupalGetSourceModule;
-  }
-
   /**
    * The module handler service.
    *
@@ -634,7 +629,13 @@
    */
   public function getSourceModule() {
     @trigger_error('MigrateSourceInterface::getSourceModule() is deprecated in drupal:10.0.0 and is removed from drupal:11.0.0. Instead you should use DrupalSourceInterface::getSourceModule(). See https://www.drupal.org/node/3306373', E_USER_DEPRECATED);
-    return $this->drupalGetSourceModule();
+    if (!empty($this->configuration['source_module'])) {
+      return $this->configuration['source_module'];
+    }
+    elseif (!empty($this->pluginDefinition['source_module'])) {
+      return $this->pluginDefinition['source_module'];
+    }
+    return NULL;
   }
 
 }