diff --git a/backend/seafile/object.go b/backend/seafile/object.go
index 25257825a..97933b1a4 100644
--- a/backend/seafile/object.go
+++ b/backend/seafile/object.go
@@ -12,7 +12,6 @@ import (
 // Object describes a seafile object (also commonly called a file)
 type Object struct {
 	fs            *Fs       // what this object is part of
-	id            string    // internal ID of object
 	remote        string    // The remote path (full path containing library name if target at root)
 	pathInLibrary string    // Path of the object without the library name
 	size          int64     // size of the object
@@ -107,7 +106,6 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
 		}
 		// Set the properties from the upload back to the object
 		o.size = uploaded.Size
-		o.id = uploaded.ID
 
 		return nil
 	}
@@ -118,10 +116,3 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
 func (o *Object) Remove(ctx context.Context) error {
 	return o.fs.deleteFile(ctx, o.libraryID, o.pathInLibrary)
 }
-
-// ==================== Optional Interface fs.IDer ====================
-
-// ID returns the ID of the Object if known, or "" if not
-func (o *Object) ID() string {
-	return o.id
-}
diff --git a/backend/seafile/seafile.go b/backend/seafile/seafile.go
index 1151def5f..fbdad6b58 100644
--- a/backend/seafile/seafile.go
+++ b/backend/seafile/seafile.go
@@ -550,7 +550,6 @@ func (f *Fs) NewObject(ctx context.Context, remote string) (fs.Object, error) {
 	o := &Object{
 		fs:            f,
 		libraryID:     libraryID,
-		id:            fileDetails.ID,
 		remote:        remote,
 		pathInLibrary: filePath,
 		modTime:       modTime,
@@ -1239,7 +1238,6 @@ func (f *Fs) buildDirEntries(parentPath, libraryID, parentPathInLibrary string,
 		} else if entry.Type == api.FileTypeFile {
 			object := &Object{
 				fs:            f,
-				id:            entry.ID,
 				remote:        filePath,
 				pathInLibrary: filePathInLibrary,
 				size:          entry.Size,
@@ -1359,5 +1357,4 @@ var (
 	_ fs.UserInfoer   = &Fs{}
 	_ fs.Shutdowner   = &Fs{}
 	_ fs.Object       = &Object{}
-	_ fs.IDer         = &Object{}
 )