diff --git a/flake.nix b/flake.nix
index fe82753..02bf378 100644
--- a/flake.nix
+++ b/flake.nix
@@ -105,7 +105,13 @@
         src = builtins.filterSource (path: type:
           baseNameOf path != "target"
         ) ./.;
-        cargoLock = { lockFile = ./Cargo.lock; };
+        cargoLock = { 
+          lockFile = ./Cargo.lock;
+          outputHashes = {
+            "core_io-0.1.0" = "sha256-tepvvnkDTYDJ3uvuuSJISevYFkl802GHBHSwn1fXKJE="; 
+            "fatfs-0.3.6" = "sha256-Z6iueATKemecxleUd5vzWMNq0PHS7hD422PXOiyDHUM=";
+          };
+        };
 
         nativeBuildInputs = [ cargo-xbuild pkgs.llvmPackages_13.clang-unwrapped ];
         buildPhase = ''