diff --git a/pkgs/by-name/li/libbytesize/package.nix b/pkgs/by-name/li/libbytesize/package.nix
index bd395682cc1459..5928f4c9a7edc5 100644
--- a/pkgs/by-name/li/libbytesize/package.nix
+++ b/pkgs/by-name/li/libbytesize/package.nix
@@ -11,7 +11,7 @@
   mpfr,
   pcre2,
   pkg-config,
-  python3,
+  python3Packages,
   stdenv,
 }:
 
@@ -41,7 +41,8 @@ stdenv.mkDerivation (finalAttrs: {
     gtk-doc
     libxslt
     pkg-config
-    python3
+    python3Packages.python
+    python3Packages.pythonImportsCheckHook
   ];
 
   buildInputs = [
@@ -52,6 +53,13 @@ stdenv.mkDerivation (finalAttrs: {
 
   strictDeps = true;
 
+  postInstall = ''
+    substituteInPlace $out/${python3Packages.python.sitePackages}/bytesize/bytesize.py \
+      --replace-fail 'CDLL("libbytesize.so.1")' "CDLL('$out/lib/libbytesize.so.1')"
+  '';
+
+  pythonImportsCheck = [ "bytesize" ];
+
   meta = {
     homepage = "https://github.com/storaged-project/libbytesize";
     description = "Tiny library providing a C 'class' for working with arbitrary big sizes in bytes";
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index bb45317ec90dee..dadaea76efecde 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1923,6 +1923,8 @@ self: super: with self; {
 
   bytecode = callPackage ../development/python-modules/bytecode { };
 
+  bytesize = toPythonModule (pkgs.libbytesize.override { python3Packages = self; });
+
   bytewax = callPackage ../development/python-modules/bytewax { };
 
   bz2file = callPackage ../development/python-modules/bz2file { };