diff --git a/libraries/chain/include/graphene/chain/transaction.hpp b/libraries/chain/include/graphene/chain/transaction.hpp
index b71783d7..69ade0e9 100644
--- a/libraries/chain/include/graphene/chain/transaction.hpp
+++ b/libraries/chain/include/graphene/chain/transaction.hpp
@@ -21,6 +21,7 @@
 
 #include <numeric>
 
+#include <arpa/inet.h> // for htonl
 
 namespace graphene { namespace chain {