diff --git a/libraries/plugins/delayed_node/delayed_node_plugin.cpp b/libraries/plugins/delayed_node/delayed_node_plugin.cpp
index 9d648fea..d0461a39 100644
--- a/libraries/plugins/delayed_node/delayed_node_plugin.cpp
+++ b/libraries/plugins/delayed_node/delayed_node_plugin.cpp
@@ -23,6 +23,7 @@
 #include <fc/network/http/websocket.hpp>
 #include <fc/rpc/websocket_api.hpp>
 #include <fc/api.hpp>
+#include <fc/smart_ref_impl.hpp>
 
 namespace graphene { namespace delayed_node {
 namespace bpo = boost::program_options;