Index: Modules/_bsddb.c
===================================================================
--- Modules/_bsddb.c	(revision 42150)
+++ Modules/_bsddb.c	(working copy)
@@ -266,6 +266,7 @@
 typedef struct {
     PyObject_HEAD
     DB_TXN*         txn;
+    PyObject        *env;
 #ifdef HAVE_WEAKREF
     PyObject        *in_weakreflist; /* List of weak references */
 #endif
@@ -928,6 +929,8 @@
     DBTxnObject* self = PyObject_New(DBTxnObject, &DBTxn_Type);
     if (self == NULL)
         return NULL;
+    Py_INCREF(myenv);
+    self->env = (PyObject*)myenv;
 #ifdef HAVE_WEAKREF
     self->in_weakreflist = NULL;
 #endif
@@ -943,6 +946,7 @@
      * open DBTxns and closing any open DBs first. */
     MYDB_END_ALLOW_THREADS;
     if (makeDBError(err)) {
+        PyObject_Del(self);
         self = NULL;
     }
     return self;
@@ -973,6 +977,7 @@
     }
 #endif
 
+    Py_DECREF(self->env);
     PyObject_Del(self);
 }