diff --git a/src/calibre/gui2/fts/dialog.py b/src/calibre/gui2/fts/dialog.py
index d282c3cc2e..ec707f1d49 100644
--- a/src/calibre/gui2/fts/dialog.py
+++ b/src/calibre/gui2/fts/dialog.py
@@ -60,10 +60,11 @@ class FTSDialog(Dialog):
             except Exception:
                 self.indexing_label.setVisible(False)
             else:
-                if p < 100:
-                    t = _('Indexing is only {0:.0%} done').format(p)
+                if p < 1:
+                    q = f'{p:.0%}'
+                    t = _('Indexing is almost complete') if q == '100%' else _('Indexing is only {} done').format(q)
                     ss = ''
-                    if p < 90:
+                    if p < 0.9:
                         ss = 'QLabel { color: red }'
                     self.indexing_label.setStyleSheet(ss)
                     self.indexing_label.setText(t)
diff --git a/src/calibre/gui2/fts/scan.py b/src/calibre/gui2/fts/scan.py
index bbe04e4eb8..a4ef77de18 100644
--- a/src/calibre/gui2/fts/scan.py
+++ b/src/calibre/gui2/fts/scan.py
@@ -103,8 +103,11 @@ class ScanProgress(QWidget):
             self.switch_anyway.setText(_('Start &searching'))
         else:
             done = total - left
-            t = _('{0} of {1} book files, {2:.0%} have been indexed').format(
-                done, total, done / (total or 1))
+            p = done / (total or 1)
+            p = f'{p:.0%}'
+            if p == '100%':
+                p = _('almost 100%')
+            t = _('{0} of {1} book files, {2} have been indexed').format(done, total, p)
             self.warn_label.setVisible(True)
             self.switch_anyway.setIcon(QIcon.ic('dialog_warning.png'))
             self.switch_anyway.setText(_('Start &searching even with incomplete indexing'))