diff --git a/pkgs/development/libraries/qt-6/modules/qtbase/default.nix b/pkgs/development/libraries/qt-6/modules/qtbase/default.nix
index 9329008e29a6..7410132dd38f 100644
--- a/pkgs/development/libraries/qt-6/modules/qtbase/default.nix
+++ b/pkgs/development/libraries/qt-6/modules/qtbase/default.nix
@@ -263,6 +263,9 @@ stdenv.mkDerivation rec {
       "-DQT_FEATURE_system_sqlite=ON"
       "-DQT_FEATURE_openssl_linked=ON"
       "-DQT_FEATURE_vulkan=ON"
+      # don't leak OS version into the final output
+      # https://bugreports.qt.io/browse/QTBUG-136060
+      "-DCMAKE_SYSTEM_VERSION="
     ]
     ++ lib.optionals (!stdenv.hostPlatform.isDarwin) [
       "-DQT_FEATURE_sctp=ON"
diff --git a/pkgs/development/libraries/qt-6/qtModule.nix b/pkgs/development/libraries/qt-6/qtModule.nix
index d21056419477..e5089813c39a 100644
--- a/pkgs/development/libraries/qt-6/qtModule.nix
+++ b/pkgs/development/libraries/qt-6/qtModule.nix
@@ -39,8 +39,11 @@ stdenv.mkDerivation (
       ++ (args.propagatedBuildInputs or [ ]);
 
     cmakeFlags =
-      args.cmakeFlags or [ ]
-      ++ lib.optional stdenv.hostPlatform.isDarwin "-DQT_NO_XCODE_MIN_VERSION_CHECK=ON";
+      # don't leak OS version into the final output
+      # https://bugreports.qt.io/browse/QTBUG-136060
+      [ "-DCMAKE_SYSTEM_VERSION=" ]
+      ++ lib.optional stdenv.hostPlatform.isDarwin "-DQT_NO_XCODE_MIN_VERSION_CHECK=ON"
+      ++ args.cmakeFlags or [ ];
 
     moveToDev = false;