diff --git a/gdk/x11/gdksettings.c b/gdk/x11/gdksettings.c
index 620a58ed0d..814dca755c 100644
--- a/gdk/x11/gdksettings.c
+++ b/gdk/x11/gdksettings.c
@@ -65,6 +65,7 @@ static const struct {
   {"Gtk/TitlebarRightClick", "gtk-titlebar-right-click"},
   {"Gtk/DialogsUseHeader",    "gtk-dialogs-use-header"},
   {"Gtk/EnablePrimaryPaste",  "gtk-enable-primary-paste"},
+  {"Gtk/PrimaryButtonWarpsSlider", "gtk-primary-button-warps-slider"},
   {"Gtk/RecentFilesMaxAge",   "gtk-recent-files-max-age"},
   {"Gtk/RecentFilesEnabled",  "gtk-recent-files-enabled"},