diff --git a/pkgs/development/python-modules/lmdb/default.nix b/pkgs/development/python-modules/lmdb/default.nix
index a97f71dad212..5d604682a826 100644
--- a/pkgs/development/python-modules/lmdb/default.nix
+++ b/pkgs/development/python-modules/lmdb/default.nix
@@ -26,16 +26,15 @@ buildPythonPackage rec {
 
   buildInputs = [ lmdb ];
 
+  nativeBuildInputs = [ cffi ];
+
   env.LMDB_FORCE_SYSTEM = 1;
 
   dependencies = [ patch-ng ];
 
   pythonImportsCheck = [ "lmdb" ];
 
-  nativeCheckInputs = [
-    cffi
-    pytestCheckHook
-  ];
+  nativeCheckInputs = [ pytestCheckHook ];
 
   meta = {
     description = "Universal Python binding for the LMDB 'Lightning' Database";