diff --git a/nixos/modules/services/x11/desktop-managers/gnome3.nix b/nixos/modules/services/x11/desktop-managers/gnome3.nix
index 6434731d951..b18d06a095d 100644
--- a/nixos/modules/services/x11/desktop-managers/gnome3.nix
+++ b/nixos/modules/services/x11/desktop-managers/gnome3.nix
@@ -29,10 +29,10 @@ let
      chmod -R a+w $out/share/gsettings-schemas/nixos-gsettings-overrides
      cat - > $out/share/gsettings-schemas/nixos-gsettings-overrides/glib-2.0/schemas/nixos-defaults.gschema.override <<- EOF
        [org.gnome.desktop.background]
-       picture-uri='${pkgs.nixos-artwork.wallpapers.simple-dark-gray}/share/artwork/gnome/nix-wallpaper-simple-dark-gray.png'
+       picture-uri='file://${pkgs.nixos-artwork.wallpapers.simple-dark-gray}/share/artwork/gnome/nix-wallpaper-simple-dark-gray.png'
 
        [org.gnome.desktop.screensaver]
-       picture-uri='${pkgs.nixos-artwork.wallpapers.simple-dark-gray-bottom}/share/artwork/gnome/nix-wallpaper-simple-dark-gray_bottom.png'
+       picture-uri='file://${pkgs.nixos-artwork.wallpapers.simple-dark-gray-bottom}/share/artwork/gnome/nix-wallpaper-simple-dark-gray_bottom.png'
 
        [org.gnome.shell]
        favorite-apps=[ 'org.gnome.Epiphany.desktop', 'evolution.desktop', 'org.gnome.Music.desktop', 'org.gnome.Photos.desktop', 'org.gnome.Nautilus.desktop', 'org.gnome.Software.desktop' ]