diff --git a/storage/ndb/src/ndbapi/TransporterFacade.cpp b/storage/ndb/src/ndbapi/TransporterFacade.cpp
index 24bf6dbbc6a..f982c36cba1 100644
--- a/storage/ndb/src/ndbapi/TransporterFacade.cpp
+++ b/storage/ndb/src/ndbapi/TransporterFacade.cpp
@@ -1527,7 +1527,8 @@ SignalSender::sendSignal(Uint16 nodeId, const SimpleSignal * s){
     signalLogger.flushSignalLog();
   }
 #endif
-  
+  assert(getNodeInfo(nodeId).m_api_reg_conf == true ||
+         s->readSignalNumber() == GSN_API_REGREQ);
   return theFacade->theTransporterRegistry->prepareSend(&s->header,
 							1, // JBB
 							&s->theData[0],