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-rw-r--r--pkgs/development/python-modules/optuna/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/python-modules/optuna/default.nix b/pkgs/development/python-modules/optuna/default.nix
index c921feadd0e..dc07fcffac2 100644
--- a/pkgs/development/python-modules/optuna/default.nix
+++ b/pkgs/development/python-modules/optuna/default.nix
@@ -70,10 +70,10 @@ buildPythonPackage rec {
     typing
   ];
 
-  configurePhase = if !(pythonOlder "3.5") then ''
+  configurePhase = lib.optionalString (! pythonOlder "3.5") ''
     substituteInPlace setup.py \
       --replace "'typing'," ""
-  '' else "";
+  '';
 
   checkPhase = ''
     pytest --ignore tests/test_cli.py \