diff --git a/crates/aiken/src/cmd/mod.rs b/crates/aiken/src/cmd/mod.rs
index 7e2757245..1fa5b2ea1 100644
--- a/crates/aiken/src/cmd/mod.rs
+++ b/crates/aiken/src/cmd/mod.rs
@@ -58,6 +58,5 @@ fn version() -> String {
         "v{} {}",
         built_info::PKG_VERSION,
         built_info::GIT_COMMIT_HASH_SHORT
-            .unwrap_or(&env::var("GIT_COMMIT_HASH_SHORT").unwrap_or("unknown".to_string()))
     )
 }
diff --git a/flake.nix b/flake.nix
index f5bff79c2..d3a144c49 100644
--- a/flake.nix
+++ b/flake.nix
@@ -34,7 +34,7 @@
           GIT_COMMIT_HASH_SHORT = self.rev or "dirty"; #  or self.dirtyRev;
 
           postPatch = ''
-          substituteInPlace crates/aiken/src/cmd/mod.rs --replace  "built_info::GIT_COMMIT_HASH_SHORT" "\"$GIT_COMMIT_HASH_SHORT\""
+          substituteInPlace crates/aiken/src/cmd/mod.rs --replace  "built_info::GIT_COMMIT_HASH_SHORT" "\"$GIT_COMMIT_HASH_SHORT\".to_string()"
           '';
           
           postInstall = ''