core/modules/editor/editor.module |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/modules/editor/editor.module b/core/modules/editor/editor.module
index f17acf9..3302f16 100644
--- a/core/modules/editor/editor.module
+++ b/core/modules/editor/editor.module
@@ -419,13 +419,13 @@ function editor_entity_update(EntityInterface $entity) {
 
     // Detect file usages that should be incremented.
     foreach ($uuids_by_field as $field => $uuids) {
-      $added_files = array_diff($uuids_by_field[$field], $original_uuids_by_field);
+      $added_files = array_diff($uuids_by_field[$field], $original_uuids_by_field[$field]);
       _editor_record_file_usage($added_files, $entity);
     }
 
     // Detect file usages that should be decremented.
     foreach ($original_uuids_by_field as $field => $uuids) {
-      $removed_files = array_diff($original_uuids_by_field[$field], $uuids_by_field);
+      $removed_files = array_diff($original_uuids_by_field[$field], $uuids_by_field[$field]);
       _editor_delete_file_usage($removed_files, $entity, 1);
     }
   }