diff --git a/config/sql/se/CollectionEbooks.sql b/config/sql/se/CollectionEbooks.sql
index 321dd8b5..9615d995 100644
--- a/config/sql/se/CollectionEbooks.sql
+++ b/config/sql/se/CollectionEbooks.sql
@@ -1,8 +1,7 @@
 CREATE TABLE `CollectionEbooks` (
-  `CollectionEbookId` int(10) unsigned NOT NULL AUTO_INCREMENT,
   `EbookId` int(10) unsigned NOT NULL,
   `CollectionId` int(10) unsigned NOT NULL,
   `SequenceNumber` int(10) unsigned NULL,
-  PRIMARY KEY (`CollectionEbookId`),
+  `SortOrder` tinyint(3) unsigned NOT NULL,
   UNIQUE KEY `idxUnique` (`EbookId`,`CollectionId`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
diff --git a/lib/CollectionMembership.php b/lib/CollectionMembership.php
index e5e8f4f6..8df0b276 100644
--- a/lib/CollectionMembership.php
+++ b/lib/CollectionMembership.php
@@ -5,9 +5,9 @@
 class CollectionMembership{
 	use Traits\Accessor;
 
-	public ?int $CollectionEbookId = null;
 	public ?int $EbookId = null;
 	public ?int $CollectionId = null;
 	public ?int $SequenceNumber = null;
+	public ?int $SortOrder = null;
 	protected ?Collection $_Collection = null;
 }
diff --git a/lib/Ebook.php b/lib/Ebook.php
index 8f8136d9..439790b8 100644
--- a/lib/Ebook.php
+++ b/lib/Ebook.php
@@ -177,7 +177,7 @@ class Ebook{
 							SELECT *
 							from CollectionEbooks
 							where EbookId = ?
-							order by CollectionEbookId
+							order by SortOrder asc
 						', [$this->EbookId], CollectionMembership::class);
 		}
 
@@ -1737,19 +1737,20 @@ class Ebook{
 	}
 
 	private function AddCollectionMemberships(): void{
-		foreach($this->CollectionMemberships as $collectionMembership){
+		foreach($this->CollectionMemberships as $sortOrder => $collectionMembership){
 			$collectionMembership->EbookId = $this->EbookId;
 			$collectionMembership->CollectionId = $collectionMembership->Collection->CollectionId;
+			$collectionMembership->SortOrder = $sortOrder;
 
 			try{
 				Db::Query('
-					INSERT into CollectionEbooks (EbookId, CollectionId, SequenceNumber)
+					INSERT into CollectionEbooks (EbookId, CollectionId, SequenceNumber, SortOrder)
 					values (?,
+						?,
 						?,
 						?)
-				', [$collectionMembership->EbookId, $collectionMembership->CollectionId, $collectionMembership->SequenceNumber]);
-
-				$collectionMembership->CollectionEbookId = Db::GetLastInsertedId();
+				', [$collectionMembership->EbookId, $collectionMembership->CollectionId, $collectionMembership->SequenceNumber,
+						$collectionMembership->SortOrder]);
 			}
 			catch(Exceptions\DuplicateDatabaseKeyException){
 				// The Ebook is already a member of this Collection.