Index: libcfa/src/concurrency/monitor.hfa
===================================================================
--- libcfa/src/concurrency/monitor.hfa	(revision d76bd7969460fb9e7c80b462b463f6cc9090c112)
+++ libcfa/src/concurrency/monitor.hfa	(revision 6c3a5ac153db4a253fa595d297454e6bac931353)
@@ -38,4 +38,6 @@
 	dtor_node     = NULL;
 }
+
+static inline void ^?{}(monitor_desc & ) {}
 
 struct monitor_guard_t {