diff --git a/installer/windows/calibre/calibre.mpi b/installer/windows/calibre/calibre.mpi
index 6ad18ddaf1..a5fc37d883 100644
--- a/installer/windows/calibre/calibre.mpi
+++ b/installer/windows/calibre/calibre.mpi
@@ -534,8 +534,6 @@ File ::8B8655B8-3823-AA02-1CDA-02F5AD4677C0 -name fetch-ebook-metadata.exe -pare
 File ::8FC3D58A-F3FA-A2D1-711F-F4C3128620CE -name podofo.dll -parent 8E5D85A4-7608-47A1-CF7C-309060D5FF40
 File ::88034147-A376-B759-D48C-5F17A47E8CC3 -name ebook-meta.exe.local -parent 8E5D85A4-7608-47A1-CF7C-309060D5FF40
 File ::6E6F2A97-6614-F2A6-1751-95C099B909FD -name pdfmanipulate.exe.local -parent 8E5D85A4-7608-47A1-CF7C-309060D5FF40
-File ::AC456A9A-6653-5852-D1F7-B04E2C1AA481 -name isbndb.exe -parent 8E5D85A4-7608-47A1-CF7C-309060D5FF40
-File ::94580010-4CE4-8EC0-3834-9A2BCCB28C70 -name isbndb.exe.local -parent 8E5D85A4-7608-47A1-CF7C-309060D5FF40
 File ::BA087530-7CF4-5460-C9AA-DE4A796C9AEB -name pdfmanipulate.exe -parent 8E5D85A4-7608-47A1-CF7C-309060D5FF40
 File ::6AF80BFC-A813-074D-897A-856744A91949 -name ebook-convert.exe.local -parent 8E5D85A4-7608-47A1-CF7C-309060D5FF40
 File ::F8C59A30-9E90-0861-5604-95E7C69C3C80 -name ebook-convert.exe -parent 8E5D85A4-7608-47A1-CF7C-309060D5FF40
diff --git a/src/calibre/gui2/dialogs/scheduler.py b/src/calibre/gui2/dialogs/scheduler.py
index 47f5a63db0..3b45e9a759 100644
--- a/src/calibre/gui2/dialogs/scheduler.py
+++ b/src/calibre/gui2/dialogs/scheduler.py
@@ -182,12 +182,12 @@ class RecipeModel(QAbstractItemModel, SearchQueryParser):
         self.reset()
 
     def index(self, row, column, parent):
-        return self.createIndex(row, column, parent.row() if parent.isValid() else -1)
+        return self.createIndex(row, column, parent.row()+1 if parent.isValid() else 0)
 
     def parent(self, index):
-        if index.internalId() == -1:
+        if index.internalId() == 0:
             return QModelIndex()
-        return self.createIndex(index.internalId(), 0, -1)
+        return self.createIndex(index.internalId()-1, 0, 0)
 
     def columnCount(self, parent):
         if not parent.isValid() or not parent.parent().isValid():