diff --git a/db_stress_tool/db_stress_test_base.cc b/db_stress_tool/db_stress_test_base.cc
index 2ec759586..a1d9b08b0 100644
--- a/db_stress_tool/db_stress_test_base.cc
+++ b/db_stress_tool/db_stress_test_base.cc
@@ -2792,8 +2792,10 @@ void StressTest::Reopen(ThreadState* thread) {
     }
     assert(s.ok());
   }
+  assert(txn_db_ == nullptr || db_ == txn_db_);
   delete db_;
   db_ = nullptr;
+  txn_db_ = nullptr;
 
   num_times_reopened_++;
   auto now = clock_->NowMicros();