diff --git a/db/db_impl.h b/db/db_impl.h
index 68c8320..a74fe7b 100644
--- a/db/db_impl.h
+++ b/db/db_impl.h
@@ -120,7 +120,7 @@ class DBImpl : public DB {
   };
 
   Status get_slot_num(const ReadOptions& options, const Slice& key,
-                      size_t *slot_num);
+                      size_t *slot_num) override;
 
   Iterator* NewInternalIterator(const ReadOptions&,
                                 SequenceNumber* latest_snapshot,
diff --git a/db/vlog_set.cpp b/db/vlog_set.cpp
index 755b594..b4b3133 100644
--- a/db/vlog_set.cpp
+++ b/db/vlog_set.cpp
@@ -103,7 +103,6 @@ VlogSet::~VlogSet() {
     vlog_file_handler.flush();
     vlog_file_handler.close();
 
-    // FIXME: SIGSEGV
     std::cout << "vlog_set.cpp line 102" << std::endl;
     vlog_handler->vlog_latch_.hard_unlock();
   }