diff --git a/transaction.cpp b/transaction.cpp
index 70c4454f0..e1e275302 100644
--- a/transaction.cpp
+++ b/transaction.cpp
@@ -26,7 +26,6 @@ using namespace std;
 using namespace json_spirit;
 using namespace dev;
 using namespace dev::eth;
-using namespace dev::eth;
 
 namespace dev {  namespace test {