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-rw-r--r--nixpkgs/pkgs/servers/klipper/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/servers/klipper/default.nix b/nixpkgs/pkgs/servers/klipper/default.nix
index f120454ac84a..aa933b0fb660 100644
--- a/nixpkgs/pkgs/servers/klipper/default.nix
+++ b/nixpkgs/pkgs/servers/klipper/default.nix
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
   };
 
   # We have no LTO on i686 since commit 22284b0
-  postPatch = lib.optional stdenv.isi686 ''
+  postPatch = lib.optionalString stdenv.isi686 ''
     substituteInPlace chelper/__init__.py \
       --replace "-flto -fwhole-program " ""
   '';