diff --git a/pkgs/kde/misc/ktextaddons/default.nix b/pkgs/kde/misc/ktextaddons/default.nix
index 4ca047e52f40..2c960ad813e4 100644
--- a/pkgs/kde/misc/ktextaddons/default.nix
+++ b/pkgs/kde/misc/ktextaddons/default.nix
@@ -2,6 +2,7 @@
   lib,
   mkKdeDerivation,
   fetchurl,
+  fetchpatch,
   qtspeech,
   qttools,
   kxmlgui,
@@ -15,6 +16,15 @@ mkKdeDerivation rec {
     hash = "sha256-ZLgGAuhLJekWRiCvP2NB+oZbhegmq49eAgYa4koneyA=";
   };
 
+  # Backport fix for Qt 6.9
+  # FIXME: remove in next update
+  patches = [
+    (fetchpatch {
+      url = "https://invent.kde.org/libraries/ktextaddons/-/commit/fdbb082aaa0125d60fdf819c9cb95c40bdb98800.patch";
+      hash = "sha256-S+yGXXhZ/OdIgMGgyzofr1BzNV44/Uz/6NAoxdN9wRk=";
+    })
+  ];
+
   extraBuildInputs = [
     qtspeech
     qttools