diff --git a/arangod/RocksDBEngine/RocksDBPrimaryIndex.cpp b/arangod/RocksDBEngine/RocksDBPrimaryIndex.cpp
index df9ada069c..867383f0d9 100644
--- a/arangod/RocksDBEngine/RocksDBPrimaryIndex.cpp
+++ b/arangod/RocksDBEngine/RocksDBPrimaryIndex.cpp
@@ -116,7 +116,6 @@ RocksDBAllIndexIterator::RocksDBAllIndexIterator(
     LogicalCollection* collection, transaction::Methods* trx,
     ManagedDocumentResult* mmdr, RocksDBPrimaryIndex const* index, bool reverse)
     : IndexIterator(collection, trx, mmdr, index),
-      _cmp(index->_cmp),
       _reverse(reverse),
       _bounds(RocksDBKeyBounds::PrimaryIndex(index->objectId())) {
   // acquire rocksdb transaction
diff --git a/arangod/RocksDBEngine/RocksDBPrimaryIndex.h b/arangod/RocksDBEngine/RocksDBPrimaryIndex.h
index ed1478a4e2..b284dccbdb 100644
--- a/arangod/RocksDBEngine/RocksDBPrimaryIndex.h
+++ b/arangod/RocksDBEngine/RocksDBPrimaryIndex.h
@@ -93,7 +93,6 @@ class RocksDBAllIndexIterator final : public IndexIterator {
   void seek(StringRef const& key);
 
  private:
-  RocksDBComparator const* _cmp;
   bool const _reverse;
   std::unique_ptr<rocksdb::Iterator> _iterator;
   RocksDBKeyBounds _bounds;