diff --git a/gtk/gtksettings.c b/gtk/gtksettings.c
index 6d096698b0..b88c6ea37d 100644
--- a/gtk/gtksettings.c
+++ b/gtk/gtksettings.c
@@ -1432,6 +1432,7 @@ gtk_settings_notify (GObject    *object,
       settings_update_theme (settings);
       break;
     case PROP_XFT_DPI:
+      settings_invalidate_style (settings);
       gtk_system_setting_changed (settings->display, GTK_SYSTEM_SETTING_DPI);
       break;
     case PROP_XFT_ANTIALIAS: