1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/applications/science/physics/sherpa/default.nix b/nixpkgs/pkgs/applications/science/physics/sherpa/default.nix
index ba519cc2d032..eb718be12e4a 100644
--- a/nixpkgs/pkgs/applications/science/physics/sherpa/default.nix
+++ b/nixpkgs/pkgs/applications/science/physics/sherpa/default.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
     sha256 = "1iwa17s8ipj6a2b8zss5csb1k5y9s5js38syvq932rxcinbyjsl4";
   };
 
-  postPatch = lib.optional (stdenv.hostPlatform.libc == "glibc") ''
+  postPatch = lib.optionalString (stdenv.hostPlatform.libc == "glibc") ''
     sed -ie '/sys\/sysctl.h/d' ATOOLS/Org/Run_Parameter.C
   '';