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-rw-r--r--nixpkgs/pkgs/development/python-modules/cmd2/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/development/python-modules/cmd2/default.nix b/nixpkgs/pkgs/development/python-modules/cmd2/default.nix
index dee6c2ab499e..b5bbc88c341f 100644
--- a/nixpkgs/pkgs/development/python-modules/cmd2/default.nix
+++ b/nixpkgs/pkgs/development/python-modules/cmd2/default.nix
@@ -15,7 +15,7 @@ buildPythonPackage rec {
 
   LC_ALL="en_US.UTF-8";
 
-  postPatch = lib.optional stdenv.isDarwin ''
+  postPatch = lib.optionalString stdenv.isDarwin ''
     # Fake the impure dependencies pbpaste and pbcopy
     mkdir bin
     echo '#!${stdenv.shell}' > bin/pbpaste