diff --git a/docs/reference/gtk/running.md b/docs/reference/gtk/running.md
index 3ddae2cc36..c8b3cfd240 100644
--- a/docs/reference/gtk/running.md
+++ b/docs/reference/gtk/running.md
@@ -5,10 +5,12 @@ Slug: gtk-running
 
 GTK inspects a number of environment variables in addition to
 standard variables like `LANG`, `PATH`, `HOME` or `DISPLAY`; mostly
-to determine paths to look for certain files. The [X11](#x11-envar),
-[Wayland](#wayland-envar), [Windows](#win32-envar) and
-[Broadway](#broadway-envar) GDK backends use some additional
-environment variables.
+to determine paths to look for certain files. The
+[X11](https://docs.gtk.org/gtk4/x11.html#x11-specific-environment-variables),
+[Wayland](https://docs.gtk.org/gtk4/wayland.html#wayland-specific-environment-variables),
+[Windows](https://docs.gtk.org/gtk4/windows.html#windows-specific-environment-variables) and
+[Broadway](https://docs.gtk.org/gtk4/broadway.html#broadway-specific-environment-variables)
+GDK backends use some additional environment variables.
 
 Note that environment variables are generally used for debugging
 purposes. They are not guaranteed to be API stable, and should not
diff --git a/docs/reference/gtk/x11.md b/docs/reference/gtk/x11.md
index 55c29c5903..a858ae261d 100644
--- a/docs/reference/gtk/x11.md
+++ b/docs/reference/gtk/x11.md
@@ -43,7 +43,7 @@ X11 details, in particular the ICCCM and the Extended Window Manager
 Hints specifications. [freedesktop.org](http://www.freedesktop.org/standards/)
 has links to many relevant specifications.
 
-The GDK manual covers [using Xlib in a GTK program](#gdk-X-Window-System-Interaction).
+The GDK manual covers [using Xlib in a GTK program](https://docs.gtk.org/gdk4/x11.html).
 
 ### Server, client, window manager