diff --git a/core/modules/field/config/field.yml b/core/modules/field/config/field.yml
new file mode 100644
index 0000000..9a4b516
--- /dev/null
+++ b/core/modules/field/config/field.yml
@@ -0,0 +1 @@
+field_purge_batch_size: 10
diff --git a/core/modules/field/field.module b/core/modules/field/field.module
index 2274b93..aaf40fd 100644
--- a/core/modules/field/field.module
+++ b/core/modules/field/field.module
@@ -323,7 +323,7 @@ function field_cron() {
   field_sync_field_status();
 
   // Do a pass of purging on deleted Field API data, if any exists.
-  $limit = variable_get('field_purge_batch_size', 10);
+  $limit = config('field')->get('field_purge_batch_size');
   field_purge_batch($limit);
 }