diff --git a/flatpak/flathub.preinstall b/flatpak/flathub.preinstall
new file mode 100644
index 0000000..92d0991
--- /dev/null
+++ b/flatpak/flathub.preinstall
@@ -0,0 +1,7 @@
+# This is for org.gnome.Epiphany and io.elementary.capnet-assist.
+# Flatpak won't install the GL runtime alongside these apps because they're published
+# in different repositories (see https://github.com/flatpak/flatpak/issues/3094 for details).
+# So explicitly install here.
+[Flatpak Preinstall org.freedesktop.Platform.GL.default]
+Branch=24.08
+IsRuntime=true
diff --git a/flatpak/meson.build b/flatpak/meson.build
index f17cf8f..de69859 100644
--- a/flatpak/meson.build
+++ b/flatpak/meson.build
@@ -1,9 +1,16 @@
 subdir('remotes.d')
 
-install_data(
+preinstall_files = [
     'appcenter.preinstall',
-    install_dir: datadir / 'flatpak' / 'preinstall.d'
-)
+    'flathub.preinstall',
+]
+
+foreach file : preinstall_files
+    install_data(
+        file,
+        install_dir: datadir / 'flatpak' / 'preinstall.d'
+    )
+endforeach
 
 systemd_system_unit_dir = get_option('systemdsystemunitdir')
 if systemd_system_unit_dir != 'no'