diff --git a/src/calibre/gui2/actions/show_template_tester.py b/src/calibre/gui2/actions/show_template_tester.py
index 3060ad4a21..1f8b98bc5a 100644
--- a/src/calibre/gui2/actions/show_template_tester.py
+++ b/src/calibre/gui2/actions/show_template_tester.py
@@ -35,7 +35,7 @@ class ShowTemplateTesterAction(InterfaceAction):
         rows = view.selectionModel().selectedRows()
         if not rows:
             return error_dialog(self.gui, _('No books selected'),
-                    _('One book must be selected'), show=True)
+                    _('At least one book must be selected'), show=True)
         mi = []
         db = view.model().db
         for row in rows: