diff --git a/pkgs/by-name/su/subtitlecomposer/package.nix b/pkgs/by-name/su/subtitlecomposer/package.nix
index e725df5c9e34..91c8ca2e58c0 100644
--- a/pkgs/by-name/su/subtitlecomposer/package.nix
+++ b/pkgs/by-name/su/subtitlecomposer/package.nix
@@ -2,11 +2,12 @@
   lib,
   fetchFromGitLab,
   cmake,
-  extra-cmake-modules,
-  ffmpeg_6,
+  pkg-config,
+  ffmpeg_7,
   openal,
   stdenv,
-  libsForQt5,
+  qt6,
+  kdePackages,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -21,16 +22,23 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-zGbI960NerlOEUvhOLm+lEJdbhj8VFUfm8pkOYGRcGw=";
   };
 
+  cmakeFlags = [
+    "-DQT_MAJOR_VERSION=6"
+    "-DQT_FIND_PRIVATE_MODULES=ON"
+  ];
+
   nativeBuildInputs = [
     cmake
-    extra-cmake-modules
-    libsForQt5.wrapQtAppsHook
+    kdePackages.extra-cmake-modules
+    pkg-config
+    qt6.wrapQtAppsHook
   ];
   buildInputs = [
-    ffmpeg_6
+    ffmpeg_7
     openal
+    qt6.qt5compat
   ]
-  ++ (with libsForQt5; [
+  ++ (with kdePackages; [
     kcodecs
     kconfig
     kconfigwidgets