diff --git a/pkgs/development/libraries/openjpeg/1.x.nix b/pkgs/development/libraries/openjpeg/1.x.nix
deleted file mode 100644
index beb151f0d2de..000000000000
--- a/pkgs/development/libraries/openjpeg/1.x.nix
+++ /dev/null
@@ -1,9 +0,0 @@
-{ callPackage, ... } @ args:
-
-callPackage ./generic.nix (args // {
-  version = "1.5.2";
-  branch = "1.5";
-  revision = "version.1.5.2";
-  sha256 = "1dvvpvb597i5z8srz2v4c5dsbxb966h125jx3m2z0r2gd2wvpfkp";
-  testsSupport = false;
-})
diff --git a/pkgs/development/libraries/openjpeg/2.x.nix b/pkgs/development/libraries/openjpeg/2.x.nix
deleted file mode 100644
index edb9c9bf8c90..000000000000
--- a/pkgs/development/libraries/openjpeg/2.x.nix
+++ /dev/null
@@ -1,21 +0,0 @@
-{ callPackage, fetchpatch, ... } @ args:
-
-callPackage ./generic.nix (args // rec {
-  version = "2.4.0";
-  branch = "2.4";
-  revision = "v${version}";
-  sha256 = "143dvy5g6v6129lzvl0r8mrgva2fppkn0zl099qmi9yi9l9h7yyf";
-
-  extraFlags = [
-    "-DOPENJPEG_INSTALL_INCLUDE_DIR=${placeholder "dev"}/include/openjpeg-${branch}"
-    "-DOPENJPEG_INSTALL_PACKAGE_DIR=${placeholder "dev"}/lib/openjpeg-${branch}"
-  ];
-
-  patches = [
-    ./fix-cmake-config-includedir.patch
-    (fetchpatch {
-      url = "https://patch-diff.githubusercontent.com/raw/uclouvain/openjpeg/pull/1321.patch";
-      sha256 = "1cjpr76nf9g65nqkfnxnjzi3bv7ifbxpc74kxxibh58pzjlp6al8";
-    })
-  ];
-})
diff --git a/pkgs/development/libraries/openjpeg/generic.nix b/pkgs/development/libraries/openjpeg/default.nix
similarity index 77%
rename from pkgs/development/libraries/openjpeg/generic.nix
rename to pkgs/development/libraries/openjpeg/default.nix
index 8c1f18b987d5..32bfa6f24584 100644
--- a/pkgs/development/libraries/openjpeg/generic.nix
+++ b/pkgs/development/libraries/openjpeg/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, cmake, pkg-config
+{ lib, stdenv, fetchFromGitHub, fetchpatch, cmake, pkg-config
 , libpng, libtiff, lcms2, jpylyzer
 , mj2Support ? true # MJ2 executables
 , jpwlLibSupport ? true # JPWL library & executables
@@ -10,8 +10,6 @@
 , thirdPartySupport ? false # Third party libraries - OFF: only build when found, ON: always build
 , testsSupport ? true
 , jdk ? null
-# Inherit generics
-, branch, version, revision, sha256, patches ? [], extraFlags ? [], ...
 }:
 
 assert jpipServerSupport -> jpipLibSupport && curl != null && fcgi != null;
@@ -23,18 +21,24 @@ let
   mkFlag = optSet: flag: "-D${flag}=${if optSet then "ON" else "OFF"}";
 in
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "openjpeg";
-  inherit version;
+  version = "2.4.0"; # don't forget to change passthru.incDir
 
   src = fetchFromGitHub {
     owner = "uclouvain";
     repo = "openjpeg";
-    rev = revision;
-    inherit sha256;
+    rev = "v${version}";
+    sha256 = "143dvy5g6v6129lzvl0r8mrgva2fppkn0zl099qmi9yi9l9h7yyf";
   };
 
-  inherit patches;
+  patches = [
+    ./fix-cmake-config-includedir.patch
+    (fetchpatch {
+      url = "https://patch-diff.githubusercontent.com/raw/uclouvain/openjpeg/pull/1321.patch";
+      sha256 = "1cjpr76nf9g65nqkfnxnjzi3bv7ifbxpc74kxxibh58pzjlp6al8";
+    })
+  ];
 
   outputs = [ "out" "dev" ];
 
@@ -52,7 +56,9 @@ stdenv.mkDerivation {
     (mkFlag jp3dSupport "BUILD_JP3D")
     (mkFlag thirdPartySupport "BUILD_THIRDPARTY")
     (mkFlag testsSupport "BUILD_TESTING")
-  ] ++ extraFlags;
+    "-DOPENJPEG_INSTALL_INCLUDE_DIR=${placeholder "dev"}/include/${passthru.incDir}"
+    "-DOPENJPEG_INSTALL_PACKAGE_DIR=${placeholder "dev"}/lib/${passthru.incDir}"
+  ];
 
   nativeBuildInputs = [ cmake pkg-config ];
 
@@ -71,7 +77,7 @@ stdenv.mkDerivation {
   '';
 
   passthru = {
-    incDir = "openjpeg-${branch}";
+    incDir = "openjpeg-2.4";
   };
 
   meta = with lib; {
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 4179ccd39f4c..1b37bd3a97c5 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -401,7 +401,8 @@ mapAliases ({
   oblogout = throw "oblogout has been removed from nixpkgs, as it's archived upstream."; # added 2019-12-10
   opencl-icd = ocl-icd; # added 2017-01-20
   openexr_ctl = ctl; # added 2018-04-25
-  openjpeg_2_1 = openjpeg_2; # added 2018-10-25
+  openjpeg_1 = throw "openjpeg_1 has been removed, use openjpeg_2 instead"; # added 2021-01-24
+  openjpeg_2 = openjpeg; # added 2021-01-25
   opensans-ttf = open-sans; # added 2018-12-04
   openssh_with_kerberos = openssh; # added 2018-01-28
   onnxruntime = throw "onnxruntime has been removed due to poor maintainability"; # added 2020-12-04
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 73b42d95b288..e0d24da0ca8b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -15944,9 +15944,7 @@ in
 
   openh264 = callPackage ../development/libraries/openh264 { };
 
-  openjpeg_1 = callPackage ../development/libraries/openjpeg/1.x.nix { };
-  openjpeg_2 = callPackage ../development/libraries/openjpeg/2.x.nix { };
-  openjpeg = openjpeg_2;
+  openjpeg = callPackage ../development/libraries/openjpeg { };
 
   openpa = callPackage ../development/libraries/openpa { };
 
@@ -21188,7 +21186,6 @@ in
   calibre = calibre-py3;
 
   calligra = libsForQt5.callPackage ../applications/office/calligra {
-    openjpeg = openjpeg_1;
     # Must use the same Qt version as Calligra itself:
     poppler = libsForQt5.poppler_0_61;
   };
@@ -22984,9 +22981,7 @@ in
 
   kpt = callPackage ../applications/networking/cluster/kpt { };
 
-  krita = libsForQt5.callPackage ../applications/graphics/krita {
-    openjpeg = openjpeg_1;
-  };
+  krita = libsForQt5.callPackage ../applications/graphics/krita { };
 
   krusader = libsForQt5.callPackage ../applications/misc/krusader { };