diff --git a/modules/nixos/configs/nix.nix b/modules/nixos/configs/nix.nix
index 5c35b15..e0bf4a7 100644
--- a/modules/nixos/configs/nix.nix
+++ b/modules/nixos/configs/nix.nix
@@ -29,6 +29,19 @@ in
       (pkg: elem (lib.getName pkg) cfg.allowUnfreePackages);
 
     nixpkgs.overlays = lib.mkBefore [
+      (final: prev: {
+        image-roll = prev.image-roll.override {
+          rustPlatform = prev.rustPlatform // {
+            buildRustPackage = args:
+              prev.rustPlatform.buildRustPackage (args // {
+                checkFlags = args.checkFlags ++ [
+                  # Image type “ico” is not supported
+                  "--skip=image::tests::save_image_uses_extensions_for_file_types_supported_by_pixbuf_save"
+                ];
+              });
+          };
+        };
+      })
       (final: prev: {
         unstable = import inputs.nixpkgs-unstable {
           inherit (config.nixpkgs) config overlays system;