diff --git a/pkgs/applications/kde/okular.nix b/pkgs/applications/kde/okular.nix
index 64511aabf7c0..5f6f28c95b08 100644
--- a/pkgs/applications/kde/okular.nix
+++ b/pkgs/applications/kde/okular.nix
@@ -1,25 +1,27 @@
 {
-  mkDerivation, lib,
+  stdenv, mkDerivation, lib,
   extra-cmake-modules, kdoctools,
-  djvulibre, ebook_tools, kactivities, karchive, kbookmarks, kcompletion,
-  kconfig, kconfigwidgets, kcoreaddons, kdbusaddons, kdegraphics-mobipocket,
-  kiconthemes, kjs, khtml, kio, kparts, kpty, kwallet, kwindowsystem, libkexiv2,
-  libspectre, phonon, poppler, qca-qt5, qtdeclarative, qtsvg, threadweaver
+  chmlib ? null, discount, djvulibre, ebook_tools, kactivities, karchive, kbookmarks,
+  kcompletion, kconfig, kconfigwidgets, kcoreaddons, kdbusaddons,
+  kdegraphics-mobipocket, kiconthemes, kjs, khtml, kio, kparts, kpty, kwallet,
+  kwindowsystem, libkexiv2, libspectre, libzip, phonon, poppler, qca-qt5,
+  qtdeclarative, qtsvg, threadweaver
 }:
 
 mkDerivation {
   name = "okular";
   nativeBuildInputs = [ extra-cmake-modules kdoctools ];
   buildInputs = [
-    djvulibre ebook_tools kactivities karchive kbookmarks kcompletion kconfig kconfigwidgets
-    kcoreaddons kdbusaddons kdegraphics-mobipocket kiconthemes kjs khtml kio
-    kparts kpty kwallet kwindowsystem libkexiv2 libspectre phonon poppler
-    qca-qt5 qtdeclarative qtsvg threadweaver
-  ];
-  meta = {
-    platforms = lib.platforms.linux;
+    discount djvulibre ebook_tools kactivities karchive kbookmarks
+    kcompletion kconfig kconfigwidgets kcoreaddons kdbusaddons
+    kdegraphics-mobipocket kiconthemes kjs khtml kio kparts kpty kwallet
+    kwindowsystem libkexiv2 libspectre libzip phonon poppler qca-qt5
+    qtdeclarative qtsvg threadweaver
+  ] ++ lib.optional (!stdenv.isAarch64) chmlib;
+  meta = with lib; {
     homepage = http://www.kde.org;
-    license = with lib.licenses; [ gpl2 lgpl21 fdl12 bsd3 ];
-    maintainers = [ lib.maintainers.ttuegel ];
+    license = with licenses; [ gpl2 lgpl21 fdl12 bsd3 ];
+    maintainers = with maintainers; [ ttuegel ];
+    platforms = lib.platforms.linux;
   };
 }