diff --git a/pkgs/development/python-modules/lmdb/default.nix b/pkgs/development/python-modules/lmdb/default.nix
index a7767be6dc4831..5835fe3196d444 100644
--- a/pkgs/development/python-modules/lmdb/default.nix
+++ b/pkgs/development/python-modules/lmdb/default.nix
@@ -1,7 +1,8 @@
 { stdenv
 , buildPythonPackage
 , fetchPypi
-, isPy3k
+, pytest
+, cffi
 }:
 
 buildPythonPackage rec {
@@ -13,8 +14,11 @@ buildPythonPackage rec {
     sha256 = "1zh38gvkqw1jm5105if6rr7ccbgyxr7k2rm5ygb9ab3bq82pyaww";
   };
 
-  # Some sort of mysterious failure with lmdb.tool
-  doCheck = !isPy3k;
+  checkInputs = [ pytest cffi ];
+  checkPhase = ''
+    export PYTHONPATH=.:$PYTHONPATH
+    py.test
+  '';
 
   meta = with stdenv.lib; {
     description = "Universal Python binding for the LMDB 'Lightning' Database";