diff --git a/src/calibre/gui2/icon_theme.py b/src/calibre/gui2/icon_theme.py
index 7c0ba8271d..b3176e6a7a 100644
--- a/src/calibre/gui2/icon_theme.py
+++ b/src/calibre/gui2/icon_theme.py
@@ -741,7 +741,7 @@ class ChooseTheme(Dialog):
         Dialog.accept(self)
 
     def accept(self):
-        if self.theme_list.currentIndex() < 0:
+        if self.theme_list.currentRow() < 0:
             return error_dialog(self, _('No theme selected'), _(
                 'You must first select an icon theme'), show=True)
         theme = self.theme_list.currentItem().data(Qt.UserRole)