diff --git a/mac/macfile.cpp b/mac/macfile.cpp
index 91529db..5ccc949 100644
--- a/mac/macfile.cpp
+++ b/mac/macfile.cpp
@@ -6,6 +6,7 @@
 #include "macfile.h"
 #include <unistd.h>
 #include <fcntl.h>
+#include <errno.h>
 #include <sys/socket.h>
 #include <security/Authorization.h>
 #include <QDebug>