diff --git a/pkgs/development/python-modules/tlsh/default.nix b/pkgs/development/python-modules/tlsh/default.nix
index b71daa2736d9..05341909dbed 100644
--- a/pkgs/development/python-modules/tlsh/default.nix
+++ b/pkgs/development/python-modules/tlsh/default.nix
@@ -18,27 +18,27 @@ buildPythonPackage rec {
     hash = "sha256-cYvXZrd+8ZC5LfucguFFNlEX8FR+AkchmCFButYoiMg=";
   };
 
-  postPatch = ''
-    substituteInPlace py_ext/setup.py \
-      --replace-fail "version = '4.5.0'" "version = '${version}'"
-  '';
-
   patches = [
     # https://github.com/trendmicro/tlsh/pull/152
     ./cmake-4-compat.patch
   ];
 
+  postPatch = ''
+    substituteInPlace py_ext/setup.py \
+      --replace-fail "4.5.0" "${version}"
+  '';
+
   nativeBuildInputs = [ cmake ];
 
+  postConfigure = ''
+    cd ../py_ext
+  '';
+
   build-system = [ setuptools ];
 
   # no test data
   doCheck = false;
 
-  postConfigure = ''
-    cd ../py_ext
-  '';
-
   pythonImportsCheck = [ "tlsh" ];
 
   meta = {