diff --git a/pkgs/development/libraries/kde-frameworks/kconfigwidgets/default.nix b/pkgs/development/libraries/kde-frameworks/kconfigwidgets/default.nix
index 3d7c7cdedefa..dcbdf6eb5f61 100644
--- a/pkgs/development/libraries/kde-frameworks/kconfigwidgets/default.nix
+++ b/pkgs/development/libraries/kde-frameworks/kconfigwidgets/default.nix
@@ -12,4 +12,7 @@ mkDerivation {
   patches = [ ./0001-qdiriterator-follow-symlinks.patch ];
   outputs = [ "out" "dev" ];
   outputBin = "dev";
+  postInstall = ''
+    moveToOutput ''${qtPluginPrefix:?}/designer/kconfigwidgets5widgets.so "$out"
+  '';
 }