diff --git a/pkgs/development/libraries/qt-5/5.12/default.nix b/pkgs/development/libraries/qt-5/5.12/default.nix
index a047b5b71081..f4a9d11c7516 100644
--- a/pkgs/development/libraries/qt-5/5.12/default.nix
+++ b/pkgs/development/libraries/qt-5/5.12/default.nix
@@ -191,6 +191,7 @@ let
         inherit (darwin.apple_sdk.libs) sandbox;
         inherit (darwin.apple_sdk.frameworks) ApplicationServices AVFoundation Foundation ForceFeedback GameController AppKit
           ImageCaptureCore CoreBluetooth IOBluetooth CoreWLAN Quartz Cocoa LocalAuthentication;
+        stdenv = stdenvActual;
       };
       qtwebglplugin = callPackage ../modules/qtwebglplugin.nix {};
       qtwebkit = callPackage ../modules/qtwebkit.nix {