diff --git a/src/calibre/gui2/metadata/basic_widgets.py b/src/calibre/gui2/metadata/basic_widgets.py
index 27112eba9a..f152bf6534 100644
--- a/src/calibre/gui2/metadata/basic_widgets.py
+++ b/src/calibre/gui2/metadata/basic_widgets.py
@@ -573,6 +573,9 @@ class SeriesIndexEdit(QDoubleSpinBox):
                 import traceback
                 traceback.print_exc()
 
+    def reset_original(self):
+        self.original_series_name = self.series_edit.current_val
+
     def break_cycles(self):
         try:
             self.series_edit.currentIndexChanged.disconnect()
diff --git a/src/calibre/gui2/metadata/single.py b/src/calibre/gui2/metadata/single.py
index 2cb9c74890..2912d4a819 100644
--- a/src/calibre/gui2/metadata/single.py
+++ b/src/calibre/gui2/metadata/single.py
@@ -376,6 +376,7 @@ class MetadataSingleDialogBase(ResizableDialog):
         if not mi.is_null('series') and mi.series.strip():
             self.series.current_val = mi.series
             if mi.series_index is not None:
+                self.series_index.reset_original()
                 self.series_index.current_val = float(mi.series_index)
         if not mi.is_null('languages'):
             langs = [canonicalize_lang(x) for x in mi.languages]