diff -u b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
--- b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
+++ b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
@@ -106,8 +106,8 @@
     $field = FieldConfig::load('node.story.field_test_four');
     $this->assertIdentical($field->label(), 'Float Field');
     $expected = array(
-      'min' => 100,
-      'max' => 200,
+      'min' => 100.0,
+      'max' => 200.0,
       'prefix' => 'id-',
       'suffix' => '',
     );