diff --git a/db/compaction_picker.cc b/db/compaction_picker.cc
index 52499f301b..c58f699e41 100644
--- a/db/compaction_picker.cc
+++ b/db/compaction_picker.cc
@@ -369,12 +369,6 @@ Compaction* LevelCompactionPicker::PickCompaction(Version* version,
   Compaction* c = nullptr;
   int level = -1;
 
-  // Compute the compactions needed. It is better to do it here
-  // and also in LogAndApply(), otherwise the values could be stale.
-  std::vector<uint64_t> size_being_compacted(NumberLevels() - 1);
-  SizeBeingCompacted(size_being_compacted);
-  version->Finalize(size_being_compacted);
-
   // We prefer compactions triggered by too much data in a level over
   // the compactions triggered by seeks.
   //
diff --git a/db/version_set.cc b/db/version_set.cc
index 96bce4b9ee..a47d4e93fc 100644
--- a/db/version_set.cc
+++ b/db/version_set.cc
@@ -469,6 +469,7 @@ Version::Version(ColumnFamilyData* cfd, VersionSet* vset,
       refs_(0),
       // cfd is nullptr if Version is dummy
       num_levels_(cfd == nullptr ? 0 : cfd->NumberLevels()),
+      finalized_(false),
       files_(new std::vector<FileMetaData*>[num_levels_]),
       files_by_size_(num_levels_),
       next_file_to_compact_by_size_(num_levels_),
@@ -486,6 +487,7 @@ void Version::Get(const ReadOptions& options,
                   GetStats* stats,
                   const Options& db_options,
                   bool* value_found) {
+  assert(finalized_);
   Slice ikey = k.internal_key();
   Slice user_key = k.user_key();
   const Comparator* ucmp = cfd_->internal_comparator().user_comparator();
@@ -651,6 +653,8 @@ bool Version::UpdateStats(const GetStats& stats) {
 }
 
 void Version::Finalize(std::vector<uint64_t>& size_being_compacted) {
+  assert(!finalized_);
+  finalized_ = true;
   // Pre-sort level0 for Get()
   if (cfd_->options()->compaction_style == kCompactionStyleUniversal) {
     std::sort(files_[0].begin(), files_[0].end(), NewestFirstBySeqNo);
diff --git a/db/version_set.h b/db/version_set.h
index 11f1b34ebc..d4473a5040 100644
--- a/db/version_set.h
+++ b/db/version_set.h
@@ -234,6 +234,7 @@ class Version {
   Version* prev_;               // Previous version in linked list
   int refs_;                    // Number of live refs to this version
   int num_levels_;              // Number of levels
+  bool finalized_;              // True if Finalized is called
 
   // List of files per level, files in each level are arranged
   // in increasing order of keys