diff --git a/src/unix/epolldispatcher.cpp b/src/unix/epolldispatcher.cpp
index 8df776cba1..e52aa35669 100644
--- a/src/unix/epolldispatcher.cpp
+++ b/src/unix/epolldispatcher.cpp
@@ -31,6 +31,7 @@
 
 #include <sys/epoll.h>
 #include <errno.h>
+#include <unistd.h>
 
 #define wxEpollDispatcher_Trace wxT("epolldispatcher")