diff --git a/src/calibre/gui2/dialogs/select_formats.py b/src/calibre/gui2/dialogs/select_formats.py
index b23a5d8498..a7caa47d6f 100644
--- a/src/calibre/gui2/dialogs/select_formats.py
+++ b/src/calibre/gui2/dialogs/select_formats.py
@@ -33,7 +33,10 @@ class Formats(QAbstractListModel):
                 fmt = fmt.upper()
             return f'{fmt} [{count}]'
         if role == Qt.ItemDataRole.DecorationRole:
-            return (self.fi.icon_from_ext(self.fmts[row].lower()))
+            fmt = self.fmts[row]
+            if fmt == '..cover..':
+                fmt = 'jpg'
+            return (self.fi.icon_from_ext(fmt.lower()))
         if role == Qt.ItemDataRole.ToolTipRole:
             fmt = self.fmts[row]
             count = self.counts[fmt]