diff --git a/arangod/RocksDBEngine/RocksDBCollection.cpp b/arangod/RocksDBEngine/RocksDBCollection.cpp
index 7ab1fe8f7e..da812faa32 100644
--- a/arangod/RocksDBEngine/RocksDBCollection.cpp
+++ b/arangod/RocksDBEngine/RocksDBCollection.cpp
@@ -57,10 +57,13 @@ namespace {
 
 static std::string const Empty;
 
+#if 0
+// currently unused. remove?
 static rocksdb::TransactionDB* db() {
   StorageEngine* engine = EngineSelectorFeature::ENGINE;
   return static_cast<RocksDBEngine*>(engine)->db();
 }
+#endif
 
 static inline rocksdb::Transaction* rocksTransaction(
     arangodb::transaction::Methods* trx) {