diff --git a/src/systemc/ext/channel/_using.hh b/src/systemc/ext/channel/_using.hh
index 58269d5..089991f 100644
--- a/src/systemc/ext/channel/_using.hh
+++ b/src/systemc/ext/channel/_using.hh
@@ -87,6 +87,7 @@
 using sc_core::SC_MANY_WRITERS;
 using sc_core::sc_signal_write_if;
 using sc_core::sc_signal_inout_if;
+using sc_core::sc_signal_out_if;
 
 using sc_core::sc_signal_resolved;
 
diff --git a/src/systemc/ext/channel/sc_signal_inout_if.hh b/src/systemc/ext/channel/sc_signal_inout_if.hh
index c39c4a5..b272162 100644
--- a/src/systemc/ext/channel/sc_signal_inout_if.hh
+++ b/src/systemc/ext/channel/sc_signal_inout_if.hh
@@ -85,6 +85,10 @@
     }
 };
 
+// Deprecated.
+template <class T>
+using sc_signal_out_if = sc_signal_inout_if<T>;
+
 } // namespace sc_core
 
 #endif  //__SYSTEMC_EXT_CHANNEL_SC_SIGNAL_INOUT_IF_HH__