diff --git a/default.nix b/default.nix
index bf0d9907d8..5494df23d5 100644
--- a/default.nix
+++ b/default.nix
@@ -33,7 +33,7 @@ stdenv.mkDerivation {
     wrapQtAppsHook
     pkg-config
     installShellFiles
-] ++ lib.optionals stdenv.isLinux [ xvfb-run ] ++ lib.optionals stdenv.isDarwin [ makeWrapper ];
+  ] ++ lib.optionals stdenv.hostPlatform.isLinux [ xvfb-run ] ++ lib.optionals stdenv.hostPlatform.isDarwin [ makeWrapper ];
 
   buildInputs = [
     qtbase
@@ -41,7 +41,7 @@ stdenv.mkDerivation {
     qtsvg
     qtwebsockets
     botan2
-  ] ++ lib.optionals stdenv.isLinux [ qtwayland ];
+  ] ++ lib.optionals stdenv.hostPlatform.isLinux [ qtwayland ];
 
   cmakeFlags = [
     "-DQON_QT6_BUILD=ON"
@@ -49,7 +49,7 @@ stdenv.mkDerivation {
   ];
 
   # Install shell completion on Linux (with xvfb-run)
-  postInstall = lib.optionalString stdenv.isLinux ''
+  postInstall = lib.optionalString stdenv.hostPlatform.isLinux ''
       installShellCompletion --cmd ${appname} \
         --bash <(xvfb-run $out/bin/${appname} --completion bash) \
         --fish <(xvfb-run $out/bin/${appname} --completion fish)
@@ -64,12 +64,11 @@ stdenv.mkDerivation {
         --fish <($out/bin/${appname} --completion fish)
   ''
   # Create a lowercase symlink for Linux
-  + lib.optionalString stdenv.isLinux ''
+  + lib.optionalString stdenv.hostPlatform.isLinux ''
     ln -s $out/bin/${appname} $out/bin/${pname}
   ''
   # Remame application for macOS as lowercase binary
-  + lib.optionalString stdenv.isDarwin ''
-    find $out
+  + lib.optionalString stdenv.hostPlatform.isDarwin ''
     # Prevent "same file" error
     mv $out/bin/${appname} $out/bin/${pname}.bin
     mv $out/bin/${pname}.bin $out/bin/${pname}