diff --git a/pkgs/servers/heisenbridge/default.nix b/pkgs/servers/heisenbridge/default.nix
index db7d40ad35d5a..703160d41d8e6 100644
--- a/pkgs/servers/heisenbridge/default.nix
+++ b/pkgs/servers/heisenbridge/default.nix
@@ -39,6 +39,7 @@ in python.pkgs.buildPythonApplication rec {
 
   nativeCheckInputs = with python.pkgs; [
     pytestCheckHook
+    pytestCheckHook
   ];
 
   meta = with lib; {