diff --git a/pkgs/by-name/ha/harper/package.nix b/pkgs/by-name/ha/harper/package.nix
index 61e1a5c3ca60..a29356e421e8 100644
--- a/pkgs/by-name/ha/harper/package.nix
+++ b/pkgs/by-name/ha/harper/package.nix
@@ -17,10 +17,18 @@ rustPlatform.buildRustPackage (finalAttrs: {
     hash = "sha256-9AA2uln9cnMzFvPbxiD05sfdAZKO7xzoJSfQbeRNE9Y=";
   };
 
-  buildAndTestSubdir = "harper-ls";
-
   cargoHash = "sha256-P90qKrV4YK1ATwclbJ8wX+rcCdE1QetNNL96/IXeIMA=";
 
+  cargoBuildFlags = [
+    "--package=harper-cli"
+    "--package=harper-ls"
+  ];
+
+  cargoTestFlags = [
+    "--package=harper-cli"
+    "--package=harper-ls"
+  ];
+
   passthru.updateScript = nix-update-script { };
 
   nativeInstallCheckInputs = [