diff --git a/pkgs/by-name/no/nomacs/package.nix b/pkgs/by-name/no/nomacs/package.nix
index ac699f437056..bd57d951d3b9 100644
--- a/pkgs/by-name/no/nomacs/package.nix
+++ b/pkgs/by-name/no/nomacs/package.nix
@@ -4,18 +4,13 @@
   exiv2,
   fetchFromGitHub,
   libraw,
-  libsForQt5,
   kdePackages,
+  qt6,
   libtiff,
   opencv4,
   pkg-config,
   stdenv,
-  qtVersion ? 5,
 }:
-let
-  myQt = if qtVersion == 5 then libsForQt5 else kdePackages;
-  inherit (myQt) wrapQtAppsHook;
-in
 stdenv.mkDerivation (finalAttrs: {
   pname = "nomacs";
   version = "3.21.1";
@@ -53,7 +48,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   nativeBuildInputs = [
     cmake
-    wrapQtAppsHook
+    qt6.wrapQtAppsHook
     pkg-config
   ];
 
@@ -65,15 +60,14 @@ stdenv.mkDerivation (finalAttrs: {
     # note `dev` is selected by `mkDerivation` automatically, so one should omit `getOutput "dev"`;
     # see: https://github.com/NixOS/nixpkgs/pull/314186#issuecomment-2129974277
     (lib.getOutput "cxxdev" opencv4)
-  ]
-  ++ (with myQt; [
-    kimageformats
-    qtbase
-    qtimageformats
-    qtsvg
-    qttools
-    quazip
-  ]);
+
+    kdePackages.kimageformats
+    qt6.qtbase
+    qt6.qtimageformats
+    qt6.qtsvg
+    qt6.qttools
+    kdePackages.quazip
+  ];
 
   cmakeFlags = [
     (lib.cmakeBool "ENABLE_OPENCV" true)
@@ -123,6 +117,6 @@ stdenv.mkDerivation (finalAttrs: {
       mindavi
       ppenguin
     ];
-    inherit (myQt.qtbase.meta) platforms;
+    inherit (qt6.qtbase.meta) platforms;
   };
 })
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 26ca575b5c5a..731d98cb3727 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -1725,6 +1725,7 @@ mapAliases {
   corepack_18 = nodejs_18; # Added 2025-04-23
   nodejs-18_x = nodejs_18; # Added 2022-11-06
   nodejs-slim-18_x = nodejs-slim_18; # Added 2022-11-06
+  nomacs-qt6 = nomacs; # Added 2025-08-30
   nomad_1_4 = throw "nomad_1_4 is no longer supported upstream. You can switch to using a newer version of the nomad package, or revert to older nixpkgs if you cannot upgrade"; # Added 2025-02-02
   nomad_1_5 = throw "nomad_1_5 is no longer supported upstream. You can switch to using a newer version of the nomad package, or revert to older nixpkgs if you cannot upgrade"; # Added 2025-02-02
   nomad_1_6 = throw "nomad_1_6 is no longer supported upstream. You can switch to using a newer version of the nomad package, or revert to older nixpkgs if you cannot upgrade"; # Added 2025-02-02
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index a0c49a34fff6..0c482df87bb2 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3700,8 +3700,6 @@ with pkgs;
     nomad_1_10
     ;
 
-  nomacs-qt6 = nomacs.override { qtVersion = 6; };
-
   nth = with python3Packages; toPythonApplication name-that-hash;
 
   nvchecker =