diff --git a/komga/src/main/kotlin/org/gotson/komga/domain/model/Media.kt b/komga/src/main/kotlin/org/gotson/komga/domain/model/Media.kt
index 909a453b1..f5442e94d 100644
--- a/komga/src/main/kotlin/org/gotson/komga/domain/model/Media.kt
+++ b/komga/src/main/kotlin/org/gotson/komga/domain/model/Media.kt
@@ -38,7 +38,7 @@ class Media(
     var thumbnail: ByteArray? = null,
 
     pages: Iterable<BookPage> = emptyList()
-) {
+) : AuditableEntity() {
   @Id
   @GeneratedValue
   @Column(name = "id", nullable = false, unique = true)
diff --git a/komga/src/main/kotlin/org/gotson/komga/interfaces/web/rest/BookController.kt b/komga/src/main/kotlin/org/gotson/komga/interfaces/web/rest/BookController.kt
index e07eb693e..a69b8e8fd 100644
--- a/komga/src/main/kotlin/org/gotson/komga/interfaces/web/rest/BookController.kt
+++ b/komga/src/main/kotlin/org/gotson/komga/interfaces/web/rest/BookController.kt
@@ -238,7 +238,7 @@ class BookController(
       ).lastModified(getBookLastModified(book))
 
   private fun getBookLastModified(book: Book) =
-      book.fileLastModified.toInstant(ZoneOffset.UTC).toEpochMilli()
+      book.media.lastModifiedDate!!.toInstant(ZoneOffset.UTC).toEpochMilli()
 
 
   private fun getMediaTypeOrDefault(mediaTypeString: String?): MediaType {
diff --git a/komga/src/main/resources/db/migration/V20200103170613__media_as_auditable_entity.sql b/komga/src/main/resources/db/migration/V20200103170613__media_as_auditable_entity.sql
new file mode 100644
index 000000000..f7f3d7d14
--- /dev/null
+++ b/komga/src/main/resources/db/migration/V20200103170613__media_as_auditable_entity.sql
@@ -0,0 +1,13 @@
+alter table media
+    add (created_date timestamp);
+alter table media
+    add (last_modified_date timestamp);
+
+update media
+set created_date       = CURRENT_TIMESTAMP(),
+    last_modified_date = CURRENT_TIMESTAMP();
+
+alter table media
+    alter column created_date set not null;
+alter table media
+    alter column last_modified_date set not null;