diff --git a/docs/reference/gdk/gdk4.toml.in b/docs/reference/gdk/gdk4.toml.in
index dfc35caa37..a052c3844f 100644
--- a/docs/reference/gdk/gdk4.toml.in
+++ b/docs/reference/gdk/gdk4.toml.in
@@ -107,4 +107,5 @@ content_images = [
   "images/popup-flip.png",
   "images/popup-slide.png",
 ]
+content_base_url = "https://gitlab.gnome.org/GNOME/gtk/-/blob/main/docs/reference/gdk/"
 urlmap_file = "urlmap.js"
diff --git a/docs/reference/gsk/gsk4.toml.in b/docs/reference/gsk/gsk4.toml.in
index dd595cd092..2038bc6495 100644
--- a/docs/reference/gsk/gsk4.toml.in
+++ b/docs/reference/gsk/gsk4.toml.in
@@ -62,4 +62,5 @@ content_images = [
   "images/stroke-miter.png",
   "images/stroke-round.png",
 ]
+content_base_url = "https://gitlab.gnome.org/GNOME/gtk/-/blob/main/docs/reference/gsk/"
 urlmap_file = "urlmap.js"
diff --git a/docs/reference/gtk/gtk4.toml.in b/docs/reference/gtk/gtk4.toml.in
index 3404a419a1..9379a03fd3 100644
--- a/docs/reference/gtk/gtk4.toml.in
+++ b/docs/reference/gtk/gtk4.toml.in
@@ -245,4 +245,5 @@ content_images = [
   "images/box-model-light.png",
   "images/box-model-dark.png",
 ]
+content_base_url = "https://gitlab.gnome.org/GNOME/gtk/-/blob/main/docs/reference/gtk/"
 urlmap_file = "urlmap.js"