diff --git a/PPI/Events.cc b/PPI/Events.cc
index eb89a50c6a5fd1d56f92b82866d39ac0ef944a2b..3525d3db9bfdf79424db17d40c7e5da631db6284 100644
--- a/PPI/Events.cc
+++ b/PPI/Events.cc
@@ -49,7 +49,7 @@ prefix_ void senf::ppi::EventDescriptor::notifyUnthrottle()
 
 prefix_ void senf::ppi::EventDescriptor::enabled(bool v)
 {
-    SENF_ASSERT(v_isRegistered()); // Module::registerEvent() call missing !!
+    SENF_ASSERT(v_isRegistered() && "Module::registerEvent() call missing");
     if (v && ! enabled_)
         v_enable();
     else if (! v && enabled_)