diff --git a/src/signaler.cpp b/src/signaler.cpp
index d064d299..25667bf5 100644
--- a/src/signaler.cpp
+++ b/src/signaler.cpp
@@ -361,7 +361,11 @@ int zmq::signaler_t::make_fdpair (fd_t *r_, fd_t *w_)
     else
     if (signaler_port != 0) {
         wchar_t mutex_name [MAX_PATH];
+#       ifdef __MINGW32__
+        _snwprintf (mutex_name, MAX_PATH, L"Global\\zmq-signaler-port-%d", signaler_port);
+#       else
         swprintf (mutex_name, MAX_PATH, L"Global\\zmq-signaler-port-%d", signaler_port);
+#       endif
 
 #       if !defined _WIN32_WCE
         sync = CreateMutexW (&sa, FALSE, mutex_name);