diff --git a/db/db_impl.cc b/db/db_impl.cc
index 3bf60a2d17118fc511892c2c1aa7ce6442cc7ba3..1a2b7f7b2632f9de80ea3a31a844f823ba2ee7dd 100644
--- a/db/db_impl.cc
+++ b/db/db_impl.cc
@@ -3064,7 +3064,6 @@ Status DBImpl::DoCompactionWork(CompactionState* compact,
   assert(compact);
   compact->CleanupBatchBuffer();
   compact->CleanupMergedBuffer();
-  bool prefix_initialized = false;
 
   // Generate file_levels_ for compaction berfore making Iterator
   compact->compaction->GenerateFileLevels();
@@ -3149,6 +3148,7 @@ Status DBImpl::DoCompactionWork(CompactionState* compact,
     // 2) send value_buffer to compaction filter and alternate the values;
     // 3) merge value_buffer with ineligible_value_buffer;
     // 4) run the modified "compaction" using the old for loop.
+    bool prefix_initialized = false;
     shared_ptr<Iterator> backup_input(
         versions_->MakeInputIterator(compact->compaction));
     backup_input->SeekToFirst();