diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000000000000000000000000000000000..2fc736a4af877daedfbb67938390094dd0fd7e07
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "build-aux/flatpak/shared-modules"]
+	path = build-aux/flatpak/shared-modules
+	url = https://github.com/flathub/shared-modules.git
diff --git a/build-aux/flatpak/org.gnome.Builder.json b/build-aux/flatpak/org.gnome.Builder.json
index 3565d9a56df7a7b58dfcb83979ca66359608fe1c..da8d34debaac7cfbaae79223484823615e011c47 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -135,6 +135,7 @@
                 }
             ]
         },
+        "shared-modules/intltool/intltool-0.51.json",
         {
             "name" : "polkit",
             "config-opts" : [
diff --git a/build-aux/flatpak/shared-modules b/build-aux/flatpak/shared-modules
new file mode 160000
index 0000000000000000000000000000000000000000..b1e7ba9bf42d17dec64ee943d3a92eb6b60d4dbf
--- /dev/null
+++ b/build-aux/flatpak/shared-modules
@@ -0,0 +1 @@
+Subproject commit b1e7ba9bf42d17dec64ee943d3a92eb6b60d4dbf