diff --git a/pkgs/development/python-modules/botan3/default.nix b/pkgs/development/python-modules/botan3/default.nix
index 998d8e289b9b..634cd19c4036 100644
--- a/pkgs/development/python-modules/botan3/default.nix
+++ b/pkgs/development/python-modules/botan3/default.nix
@@ -34,7 +34,7 @@ buildPythonPackage rec {
     setuptools-scm
   ];
 
-  sourceRoot = "Botan-${version}/src/python";
+  sourceRoot = "source/src/python";
 
   postPatch = ''
     # remove again, when https://github.com/randombit/botan/pull/5040 got