diff --git a/pkgs/development/python-modules/ibm-watson/default.nix b/pkgs/development/python-modules/ibm-watson/default.nix
index 43257149f58b..0de9070fca5d 100644
--- a/pkgs/development/python-modules/ibm-watson/default.nix
+++ b/pkgs/development/python-modules/ibm-watson/default.nix
@@ -5,7 +5,6 @@
 , pytestCheckHook
 , python-dotenv
 , pytest-rerunfailures
-, tox
 , requests
 , python-dateutil
 , websocket-client
@@ -39,7 +38,6 @@ buildPythonPackage rec {
     pytestCheckHook
     python-dotenv
     pytest-rerunfailures
-    tox
   ];
 
   postPatch = ''