diff --git a/pkgs/development/libraries/mapnik/catch2-src.patch b/pkgs/development/libraries/mapnik/catch2-src.patch
deleted file mode 100644
index 04c6f7add217..000000000000
--- a/pkgs/development/libraries/mapnik/catch2-src.patch
+++ /dev/null
@@ -1,14 +0,0 @@
-diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
-index 0705ddce1..771291b88 100644
---- a/test/CMakeLists.txt
-+++ b/test/CMakeLists.txt
-@@ -7,8 +7,7 @@ include(FetchContent)
- 
- FetchContent_Declare(
-   Catch2
--  GIT_REPOSITORY https://github.com/catchorg/Catch2.git
--  GIT_TAG        v2.13.7)
-+  SOURCE_DIR @catch2_src@)
- FetchContent_MakeAvailable(Catch2)
- 
- if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.19.0") 
diff --git a/pkgs/development/libraries/mapnik/default.nix b/pkgs/development/libraries/mapnik/default.nix
index 7d8848f59b58..2038a185ed94 100644
--- a/pkgs/development/libraries/mapnik/default.nix
+++ b/pkgs/development/libraries/mapnik/default.nix
@@ -1,29 +1,29 @@
-{ lib
-, stdenv
-, fetchFromGitHub
-, buildPackages
-, cmake
-, pkg-config
-, substituteAll
-, boost
-, cairo
-, freetype
-, gdal
-, harfbuzz
-, icu
-, libjpeg
-, libpng
-, libtiff
-, libwebp
-, libxml2
-, proj
-, python3
-, sqlite
-, zlib
-, catch2
-, postgresql
-, protozero
-, sparsehash
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  buildPackages,
+  cmake,
+  pkg-config,
+  boost,
+  cairo,
+  freetype,
+  gdal,
+  harfbuzz,
+  icu,
+  libjpeg,
+  libpng,
+  libtiff,
+  libwebp,
+  libxml2,
+  proj,
+  python3,
+  sqlite,
+  zlib,
+  catch2,
+  postgresql,
+  protozero,
+  sparsehash,
 }:
 
 stdenv.mkDerivation rec {
@@ -56,18 +56,16 @@ stdenv.mkDerivation rec {
     # Upstream HarfBuzz wants to drop CMake support anyway.
     # See discussion: https://github.com/mapnik/mapnik/issues/4265
     ./cmake-harfbuzz.patch
-    # prevent CMake from trying to get libraries on the Internet
-    (substituteAll {
-      src = ./catch2-src.patch;
-      catch2_src = catch2.src;
-    })
     # Account for full paths when generating libmapnik.pc
     ./export-pkg-config-full-paths.patch
     # Use 'sparsehash' package.
     ./use-sparsehash-package.patch
   ];
 
-  nativeBuildInputs = [ cmake pkg-config ];
+  nativeBuildInputs = [
+    cmake
+    pkg-config
+  ];
 
   buildInputs = [
     boost
@@ -100,6 +98,8 @@ stdenv.mkDerivation rec {
     (lib.cmakeBool "USE_EXTERNAL_MAPBOX_PROTOZERO" true)
     # macOS builds fail when using memory mapped file cache.
     (lib.cmakeBool "USE_MEMORY_MAPPED_FILE" (!stdenv.hostPlatform.isDarwin))
+    # don't try to download sources for catch2, use our own
+    (lib.cmakeFeature "FETCHCONTENT_SOURCE_DIR_CATCH2" "${catch2.src}")
   ];
 
   doCheck = true;
@@ -122,7 +122,10 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Open source toolkit for developing mapping applications";
     homepage = "https://mapnik.org";
-    maintainers = with maintainers; [ hrdinka hummeltech ];
+    maintainers = with maintainers; [
+      hrdinka
+      hummeltech
+    ];
     license = licenses.lgpl21Plus;
     platforms = platforms.all;
   };