diff --git a/src/select.cpp b/src/select.cpp
index 36b04eac..78d3afda 100644
--- a/src/select.cpp
+++ b/src/select.cpp
@@ -23,9 +23,6 @@
 #include <algorithm>
 
 #ifdef ZMQ_HAVE_WINDOWS
-#if !defined FD_SETSIZE
-#define FD_SETSIZE 1024
-#endif
 #include "winsock2.h"
 #elif defined ZMQ_HAVE_HPUX
 #include <sys/param.h>