diff --git a/video/gtk4/README.md b/video/gtk4/README.md
index e9f0c708..404340b6 100644
--- a/video/gtk4/README.md
+++ b/video/gtk4/README.md
@@ -48,7 +48,7 @@ To build and include the plugin in a Flatpak manifest, you can add the following
             ],
             "build-options": {
                 "env": {
-                    "CARGO_HOME": "/run/build/gst-plugin-gtk4/cargo"
+                    "CARGO_HOME": "$FLATPAK_BUILDER_BUILDDIR/cargo"
                 }
             },
             "build-commands": [