diff --git a/tools/db_bench_tool.cc b/tools/db_bench_tool.cc
index 083f130d2..177a4aeea 100644
--- a/tools/db_bench_tool.cc
+++ b/tools/db_bench_tool.cc
@@ -3504,7 +3504,7 @@ void VerifyDBFromDB(std::string& truth_db_name) {
         case RANDOM:
           return rand_->Next() % num_;
         case UNIQUE_RANDOM:
-          assert(next_ + 1 < num_);
+          assert(next_ < num_);
           return values_[next_++];
       }
       assert(false);