diff --git a/flake.nix b/flake.nix
index df4f03a1..9c858ce7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -122,6 +122,9 @@
         src = ./src;
         cargoLock = { 
           lockFile = src/Cargo.lock;
+          outputHashes = {
+              "tar-no-std-0.1.8" = "sha256-xm17108v4smXOqxdLvHl9CxTCJslmeogjm4Y87IXFuM=";
+            };
         };
 
         nativeBuildInputs = [