Index: libcfa/src/concurrency/monitor.hfa
===================================================================
--- libcfa/src/concurrency/monitor.hfa	(revision d76bd7969460fb9e7c80b462b463f6cc9090c112)
+++ libcfa/src/concurrency/monitor.hfa	(revision e71c1d42d8496ccd3b54a96f7ca5013bba8d0198)
@@ -38,4 +38,6 @@
 	dtor_node     = NULL;
 }
+
+static inline void ^?{}(monitor_desc & ) {}
 
 struct monitor_guard_t {