diff --git a/libs/surfaces/contourdesign/contourdesign.cc b/libs/surfaces/contourdesign/contourdesign.cc
index 7694592e56..1b03e9869f 100644
--- a/libs/surfaces/contourdesign/contourdesign.cc
+++ b/libs/surfaces/contourdesign/contourdesign.cc
@@ -93,6 +93,17 @@ ContourDesignControlProtocol::probe ()
 	return true;
 }
 
+void*
+ContourDesignControlProtocol::request_factory (uint32_t num_requests)
+{
+	/* AbstractUI<T>::request_buffer_factory() is a template method only
+	 * instantiated in this source module. To provide something visible for
+	 * use in the interface/descriptor, we have this static method that is
+	 * template-free.
+	 */
+	return request_buffer_factory (num_requests);
+}
+
 int
 ContourDesignControlProtocol::set_active (bool yn)
 {
diff --git a/libs/surfaces/contourdesign/contourdesign.h b/libs/surfaces/contourdesign/contourdesign.h
index 6c81c0a099..58244f3a6a 100644
--- a/libs/surfaces/contourdesign/contourdesign.h
+++ b/libs/surfaces/contourdesign/contourdesign.h
@@ -78,6 +78,7 @@ public:
 	DeviceType device_type() const { return _device_type; }
 
 	static bool probe ();
+	static void* request_factory (uint32_t);
 
 	int set_active (bool yn);
 
diff --git a/libs/surfaces/contourdesign/interface.cc b/libs/surfaces/contourdesign/interface.cc
index b1eb379a4d..06adde30c4 100644
--- a/libs/surfaces/contourdesign/interface.cc
+++ b/libs/surfaces/contourdesign/interface.cc
@@ -50,16 +50,23 @@ probe_contourdesign_protocol (ControlProtocolDescriptor*)
 	return ContourDesignControlProtocol::probe ();
 }
 
+static void*
+contourdesign_request_buffer_factory (uint32_t num_requests)
+{
+	return ContourDesignControlProtocol::request_factory (num_requests);
+}
+
 static ControlProtocolDescriptor contourdesign_descriptor = {
-	name : "ContourDesign",
-	id : "uri://ardour.org/surfaces/contourdesign:0",
-	ptr : 0,
-	module : 0,
-	mandatory : 0,
-	supports_feedback : false,
-	probe : probe_contourdesign_protocol,
-	initialize : new_contourdesign_protocol,
-	destroy : delete_contourdesign_protocol
+	/* name :                   */ "ContourDesign",
+	/* id :                     */ "uri://ardour.org/surfaces/contourdesign:0",
+	/* ptr :                    */ 0,
+	/* module :                 */ 0,
+	/* mandatory :              */ 0,
+	/* supports_feedback :      */ false,
+	/* probe :                  */ probe_contourdesign_protocol,
+	/* initialize :             */ new_contourdesign_protocol,
+	/* destroy :                */ delete_contourdesign_protocol,
+	/* request_buffer_factory : */ contourdesign_request_buffer_factory
 };
 
 extern "C" ARDOURSURFACE_API ControlProtocolDescriptor* protocol_descriptor () { return &contourdesign_descriptor; }