diff --git a/src/signaler.cpp b/src/signaler.cpp
index a8446d70..a1578db3 100644
--- a/src/signaler.cpp
+++ b/src/signaler.cpp
@@ -68,7 +68,6 @@
 #else
 #include <unistd.h>
 #include <netinet/tcp.h>
-#include <unistd.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #endif
diff --git a/src/zmq.cpp b/src/zmq.cpp
index e74f4f87..4be44136 100644
--- a/src/zmq.cpp
+++ b/src/zmq.cpp
@@ -81,10 +81,6 @@ struct iovec {
 #include "socket_poller.hpp"
 #include "timers.hpp"
 
-#if !defined ZMQ_HAVE_WINDOWS
-#include <unistd.h>
-#endif
-
 #if defined ZMQ_HAVE_OPENPGM
 #define __PGM_WININT_H__
 #include <pgm/pgm.h>