diff --git a/libs/ardour/luabindings.cc b/libs/ardour/luabindings.cc
index 533395f5bb..89d132015c 100644
--- a/libs/ardour/luabindings.cc
+++ b/libs/ardour/luabindings.cc
@@ -303,6 +303,7 @@ LuaBindings::common (lua_State* L)
 		.addFunction ("reset", &PBD::RingBufferNPT<uint8_t>::reset)
 		.addFunction ("read", &PBD::RingBufferNPT<uint8_t>::read)
 		.addFunction ("write", &PBD::RingBufferNPT<uint8_t>::write)
+		.addFunction ("write_one", &PBD::RingBufferNPT<uint8_t>::write_one)
 		.addFunction ("write_space", &PBD::RingBufferNPT<uint8_t>::write_space)
 		.addFunction ("read_space", &PBD::RingBufferNPT<uint8_t>::read_space)
 		.addFunction ("increment_read_ptr", &PBD::RingBufferNPT<uint8_t>::increment_read_ptr)
@@ -314,6 +315,7 @@ LuaBindings::common (lua_State* L)
 		.addFunction ("reset", &PBD::RingBufferNPT<float>::reset)
 		.addFunction ("read", &PBD::RingBufferNPT<float>::read)
 		.addFunction ("write", &PBD::RingBufferNPT<float>::write)
+		.addFunction ("write_one", &PBD::RingBufferNPT<float>::write_one)
 		.addFunction ("write_space", &PBD::RingBufferNPT<float>::write_space)
 		.addFunction ("read_space", &PBD::RingBufferNPT<float>::read_space)
 		.addFunction ("increment_read_ptr", &PBD::RingBufferNPT<float>::increment_read_ptr)
@@ -325,6 +327,7 @@ LuaBindings::common (lua_State* L)
 		.addFunction ("reset", &PBD::RingBufferNPT<int>::reset)
 		.addFunction ("read", &PBD::RingBufferNPT<int>::read)
 		.addFunction ("write", &PBD::RingBufferNPT<int>::write)
+		.addFunction ("write_one", &PBD::RingBufferNPT<int>::write_one)
 		.addFunction ("write_space", &PBD::RingBufferNPT<int>::write_space)
 		.addFunction ("read_space", &PBD::RingBufferNPT<int>::read_space)
 		.addFunction ("increment_read_ptr", &PBD::RingBufferNPT<int>::increment_read_ptr)
diff --git a/libs/pbd/pbd/ringbufferNPT.h b/libs/pbd/pbd/ringbufferNPT.h
index f01a6f3a16..267adf83ff 100644
--- a/libs/pbd/pbd/ringbufferNPT.h
+++ b/libs/pbd/pbd/ringbufferNPT.h
@@ -59,6 +59,7 @@ class /*LIBPBD_API*/ RingBufferNPT
 
 	size_t  read  (T *dest, size_t cnt);
 	size_t  write (const T *src, size_t cnt);
+	size_t  write_one (const T src);
 
 	struct rw_vector {
 	    T *buf[2];
@@ -198,6 +199,12 @@ RingBufferNPT<T>::write (const T *src, size_t cnt)
         return to_write;
 }
 
+template<class T> /*LIBPBD_API*/ size_t
+RingBufferNPT<T>::write_one (const T src)
+{
+	return write (&src, 1);
+}
+
 template<class T> /*LIBPBD_API*/ void
 RingBufferNPT<T>::get_read_vector (typename RingBufferNPT<T>::rw_vector *vec)
 {