diff --git a/src/msg.cpp b/src/msg.cpp
index 00ed1595..95116b90 100644
--- a/src/msg.cpp
+++ b/src/msg.cpp
@@ -27,6 +27,12 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include "platform.hpp"
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
 #include "msg.hpp"
 #include "../include/zmq.h"