diff --git a/pkgs/by-name/ja/ja2-stracciatella/package.nix b/pkgs/by-name/ja/ja2-stracciatella/package.nix
index c85089b984b04..4ea0e8a1f5878 100644
--- a/pkgs/by-name/ja/ja2-stracciatella/package.nix
+++ b/pkgs/by-name/ja/ja2-stracciatella/package.nix
@@ -15,10 +15,9 @@
 }:
 
 let
-  stringTheoryUrl = "https://github.com/zrax/string_theory/archive/3.1.tar.gz";
   stringTheory = fetchurl {
-    url = stringTheoryUrl;
-    sha256 = "1flq26kkvx2m1yd38ldcq2k046yqw07jahms8a6614m924bmbv41";
+    url = "https://github.com/zrax/string_theory/archive/3.1.tar.gz";
+    hash = "sha256-gexVFxGpkmCMQrpCJQ/g2BsCpsCsUTSaD1X0PacRmLo=";
   };
 in
 stdenv.mkDerivation rec {
@@ -28,8 +27,8 @@ stdenv.mkDerivation rec {
   src = fetchFromGitHub {
     owner = "ja2-stracciatella";
     repo = "ja2-stracciatella";
-    rev = "v${version}";
-    sha256 = "0m6rvgkba29jy3yq5hs1sn26mwrjl6mamqnv4plrid5fqaivhn6j";
+    tag = "v${version}";
+    hash = "sha256-0li4o8KutJjpJdviqqqhMvNqhNVBw4L98DIJtebb2VQ=";
   };
 
   patches = [
@@ -37,6 +36,14 @@ stdenv.mkDerivation rec {
     ./dont-use-vendored-sdl2.patch
   ];
 
+  postPatch = ''
+    # Patch dependencies that are usually loaded by url
+    substituteInPlace dependencies/lib-string_theory/builder/CMakeLists.txt.in \
+      --replace-fail ${stringTheory.url} file://${stringTheory}
+  '';
+
+  strictDeps = true;
+
   nativeBuildInputs = [
     cmake
     python3
@@ -64,26 +71,26 @@ stdenv.mkDerivation rec {
     hash = "sha256-zkctR16QIjCTiDmrhFqPPOThbPwsm0T0nlnCekkXNN8=";
   };
 
-  preConfigure = ''
-    # Patch dependencies that are usually loaded by url
-    substituteInPlace dependencies/lib-string_theory/builder/CMakeLists.txt.in \
-      --replace ${stringTheoryUrl} file://${stringTheory}
-
-    cmakeFlagsArray+=("-DLOCAL_RAPIDJSON_LIB=OFF" "-DLOCAL_GTEST_LIB=OFF" "-DEXTRA_DATA_DIR=$out/share/ja2")
-  '';
+  cmakeFlags = [
+    (lib.cmakeBool "LOCAL_RAPIDJSON_LIB" false)
+    (lib.cmakeBool "LOCAL_GTEST_LIB" false)
+    (lib.cmakeFeature "EXTRA_DATA_DIR" "${placeholder "out"}/share/ja2")
+  ];
 
   # error: 'uint64_t' does not name a type
   # gcc13 and above don't automatically include cstdint
   env.CXXFLAGS = "-include cstdint";
 
   doInstallCheck = true;
+
   installCheckPhase = ''
-    HOME=/tmp $out/bin/ja2 -unittests
+    HOME=$(mktemp -d) $out/bin/ja2 -unittests
   '';
 
   meta = {
     description = "Jagged Alliance 2, with community fixes";
     license = "SFI Source Code license agreement";
     homepage = "https://ja2-stracciatella.github.io/";
+    maintainers = [ ];
   };
 }