diff --git a/implementations/onblocks/datanodestore/DataInnerNode.cpp b/implementations/onblocks/datanodestore/DataInnerNode.cpp
index 537e5d5d..fcfd9b6a 100644
--- a/implementations/onblocks/datanodestore/DataInnerNode.cpp
+++ b/implementations/onblocks/datanodestore/DataInnerNode.cpp
@@ -1,7 +1,6 @@
 #include "DataInnerNode.h"
 #include "DataNodeStore.h"
 
-using std::unique_ptr;
 using blockstore::Block;
 using cpputils::Data;
 using cpputils::unique_ref;
diff --git a/implementations/onblocks/datanodestore/DataLeafNode.cpp b/implementations/onblocks/datanodestore/DataLeafNode.cpp
index 72ddbaf4..3ab7e910 100644
--- a/implementations/onblocks/datanodestore/DataLeafNode.cpp
+++ b/implementations/onblocks/datanodestore/DataLeafNode.cpp
@@ -1,7 +1,6 @@
 #include "DataLeafNode.h"
 #include "DataInnerNode.h"
 
-using std::unique_ptr;
 using blockstore::Block;
 using cpputils::Data;
 using blockstore::Key;
diff --git a/implementations/onblocks/datanodestore/DataNodeStore.cpp b/implementations/onblocks/datanodestore/DataNodeStore.cpp
index d4696cf3..0d50258f 100644
--- a/implementations/onblocks/datanodestore/DataNodeStore.cpp
+++ b/implementations/onblocks/datanodestore/DataNodeStore.cpp
@@ -12,7 +12,6 @@ using blockstore::Key;
 using cpputils::Data;
 using cpputils::unique_ref;
 using cpputils::make_unique_ref;
-using std::unique_ptr;
 using std::runtime_error;
 using boost::optional;
 using boost::none;
diff --git a/implementations/onblocks/datatreestore/DataTreeStore.cpp b/implementations/onblocks/datatreestore/DataTreeStore.cpp
index d1b1c07f..38ae3060 100644
--- a/implementations/onblocks/datatreestore/DataTreeStore.cpp
+++ b/implementations/onblocks/datatreestore/DataTreeStore.cpp
@@ -3,7 +3,6 @@
 #include "../datanodestore/DataLeafNode.h"
 #include "DataTree.h"
 
-using std::unique_ptr;
 using cpputils::unique_ref;
 using cpputils::make_unique_ref;
 using boost::optional;