diff --git a/implementations/onblocks/BlobStoreOnBlocks.cpp b/implementations/onblocks/BlobStoreOnBlocks.cpp
index 4048314d..aaa55fbb 100644
--- a/implementations/onblocks/BlobStoreOnBlocks.cpp
+++ b/implementations/onblocks/BlobStoreOnBlocks.cpp
@@ -3,6 +3,7 @@
 #include "datatreestore/DataTreeStore.h"
 #include "datatreestore/DataTree.h"
 #include "BlobStoreOnBlocks.h"
+#include <messmer/blockstore/implementations/synchronized/SynchronizedBlockStore.h>
 
 #include "BlobOnBlocks.h"
 #include <messmer/cpp-utils/pointer.h>
@@ -11,6 +12,7 @@ using std::unique_ptr;
 using std::make_unique;
 
 using blockstore::BlockStore;
+using blockstore::synchronized::SynchronizedBlockStore;
 using blockstore::Key;
 using cpputils::dynamic_pointer_move;
 
@@ -21,7 +23,7 @@ using datanodestore::DataNodeStore;
 using datatreestore::DataTreeStore;
 
 BlobStoreOnBlocks::BlobStoreOnBlocks(unique_ptr<BlockStore> blockStore, uint32_t blocksizeBytes)
-: _dataTreeStore(make_unique<DataTreeStore>(make_unique<DataNodeStore>(std::move(blockStore), blocksizeBytes))) {
+: _dataTreeStore(make_unique<DataTreeStore>(make_unique<DataNodeStore>(make_unique<SynchronizedBlockStore>(std::move(blockStore)), blocksizeBytes))) {
 }
 
 BlobStoreOnBlocks::~BlobStoreOnBlocks() {