diff --git a/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
index 6ce595cffa..f92b93ed68 100644
--- a/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
+++ b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
@@ -459,7 +459,7 @@ public function validateCredentialForm(array &$form, FormStateInterface $form_st
       if (!$version) {
         $form_state->setErrorByName($database['driver'] . '][0', $this->t('Source database does not contain a recognizable Drupal version.'));
       }
-      elseif ($version != $form_state->getValue('version')) {
+      elseif ($version !== (string) $form_state->getValue('version')) {
         $form_state->setErrorByName($database['driver'] . '][0', $this->t('Source database is Drupal version @version but version @selected was selected.', [
           '@version' => $version,
           '@selected' => $form_state->getValue('version'),
@@ -482,7 +482,7 @@ public function validateCredentialForm(array &$form, FormStateInterface $form_st
         // Store the retrieved migration IDs in form storage.
         $form_state->set('version', $version);
         $form_state->set('migrations', $migration_array);
-        if ($version == '6') {
+        if ($version === '6') {
           $form_state->set('source_base_path', $form_state->getValue('d6_source_base_path'));
         }
         else {