diff --git a/pkgs/development/libraries/libblockdev/default.nix b/pkgs/development/libraries/libblockdev/default.nix
index 7679aefe5b95..6e0f9858f730 100644
--- a/pkgs/development/libraries/libblockdev/default.nix
+++ b/pkgs/development/libraries/libblockdev/default.nix
@@ -40,12 +40,18 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-WCMedMkaMMhZbB3iJu3c+CTT3AvOjzOSYP45J+NQEDQ=";
   };
 
-  outputs = [ "out" "dev" "devdoc" ];
+  outputs = [ "out" "dev" "devdoc" "python" ];
 
   postPatch = ''
     patchShebangs scripts
+    substituteInPlace src/python/gi/overrides/Makefile.am \
+      --replace-fail ''\'''${exec_prefix}' '@PYTHON_EXEC_PREFIX@'
   '';
 
+  configureFlags = [
+    "--with-python_prefix=${placeholder "python"}"
+  ];
+
   nativeBuildInputs = [
     autoconf-archive
     autoreconfHook