diff --git a/pkgs/by-name/ty/ty/package.nix b/pkgs/by-name/ty/ty/package.nix
index a8653f65abb9..2357ae5216c6 100644
--- a/pkgs/by-name/ty/ty/package.nix
+++ b/pkgs/by-name/ty/ty/package.nix
@@ -7,6 +7,9 @@
   # nativeBuildInputs
   installShellFiles,
 
+  # buildInputs
+  rust-jemalloc-sys,
+
   buildPackages,
   versionCheckHook,
   nix-update-script,
@@ -38,6 +41,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
   cargoHash = "sha256-8DaJWHFBoVzpbkd9QmJ72a5NeKuX99lfDq3uUp+wd5I=";
 
   nativeBuildInputs = [ installShellFiles ];
+  buildInputs = [ rust-jemalloc-sys ];
 
   # `ty`'s tests use `insta-cmd`, which depends on the structure of the `target/` directory,
   # and also fails to find the environment variable `$CARGO_BIN_EXE_ty`, which leads to tests failing.