diff --git a/nixos/modules/services/x11/desktop-managers/plasma5.nix b/nixos/modules/services/x11/desktop-managers/plasma5.nix
index 685a93d952b..19ad3a342c4 100644
--- a/nixos/modules/services/x11/desktop-managers/plasma5.nix
+++ b/nixos/modules/services/x11/desktop-managers/plasma5.nix
@@ -25,8 +25,8 @@ in
         type = types.bool;
         default = true;
         description = ''
-          Enable support for Qt 4-based applications. Particularly, install the
-          Qt 4 version of the Breeze theme and a default backend for Phonon.
+          Enable support for Qt 4-based applications. Particularly, install a
+          default backend for Phonon.
         '';
       };
 
@@ -146,7 +146,7 @@ in
           libsForQt5.phonon-backend-gstreamer
         ]
 
-        ++ lib.optionals cfg.enableQt4Support [ breeze-qt4 pkgs.phonon-backend-gstreamer ]
+        ++ lib.optionals cfg.enableQt4Support [ pkgs.phonon-backend-gstreamer ]
 
         # Optional hardware support features
         ++ lib.optional config.hardware.bluetooth.enable bluedevil
diff --git a/pkgs/desktops/plasma-5/breeze-qt4.nix b/pkgs/desktops/plasma-5/breeze-qt4.nix
deleted file mode 100644
index 6c31398037b..00000000000
--- a/pkgs/desktops/plasma-5/breeze-qt4.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-{
-  mkDerivation, lib,
-  automoc4, cmake, perl, pkgconfig,
-  kdelibs4, qt4, xproto
-}:
-
-mkDerivation {
-  name = "breeze-qt4";
-  sname = "breeze";
-  buildInputs = [ kdelibs4 qt4 xproto ];
-  nativeBuildInputs = [ automoc4 cmake perl pkgconfig ];
-  outputs = [ "out" "dev" ];
-  cmakeFlags = [
-    "-DUSE_KDE4=ON"
-    "-DQT_QMAKE_EXECUTABLE=${qt4}/bin/qmake"
-  ];
-}
diff --git a/pkgs/desktops/plasma-5/default.nix b/pkgs/desktops/plasma-5/default.nix
index cae5c74b442..0972673b7b8 100644
--- a/pkgs/desktops/plasma-5/default.nix
+++ b/pkgs/desktops/plasma-5/default.nix
@@ -100,7 +100,6 @@ let
     in {
       bluedevil = callPackage ./bluedevil.nix {};
       breeze-gtk = callPackage ./breeze-gtk.nix {};
-      breeze-qt4 = callPackage ./breeze-qt4.nix {};
       breeze-qt5 = callPackage ./breeze-qt5.nix {};
       breeze-grub = callPackage ./breeze-grub.nix {};
       breeze-plymouth = callPackage ./breeze-plymouth {};
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3447fa2f2b6..fb991b448ae 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -18613,7 +18613,7 @@ with pkgs;
   inherit (kdeFrameworks) kded kinit frameworkintegration;
 
   inherit (plasma5)
-    bluedevil breeze-gtk breeze-qt4 breeze-qt5 breeze-grub breeze-plymouth
+    bluedevil breeze-gtk breeze-qt5 breeze-grub breeze-plymouth
     kactivitymanagerd kde-cli-tools kde-gtk-config kdeplasma-addons kgamma5
     kinfocenter kmenuedit kscreen kscreenlocker ksshaskpass ksysguard
     kwallet-pam kwayland-integration kwin kwrited milou oxygen plasma-desktop