diff --git a/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp b/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
index b4d1cae1b..f6597428d 100644
--- a/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
+++ b/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
@@ -80,8 +80,10 @@ template class tsFreeList
 #   pragma warning ( pop )
 #endif
 
+extern "C" {
 static void ipAddrToAsciiEngineGlobalMutexConstruct ( void * );
 static void ipAddrToAsciiEngineGlobalMutexDestruct ( void * );
+}
 
 // - this class executes the synchronous DNS query
 // - it creates one thread