diff --git a/src/ip.cpp b/src/ip.cpp
index 22cf3317..eb0e1181 100644
--- a/src/ip.cpp
+++ b/src/ip.cpp
@@ -108,7 +108,7 @@ void zmq::enable_ipv4_mapping (fd_t s_)
 {
   (void) s_;
 
-#ifdef IPV6_V6ONLY
+#if defined IPV6_V6ONLY && !defined ZMQ_HAVE_OPENBSD
 #ifdef ZMQ_HAVE_WINDOWS
     DWORD flag = 0;
 #else