diff --git a/server/linuxport.cpp b/server/linuxport.cpp
index b5f7178..a04df1e 100644
--- a/server/linuxport.cpp
+++ b/server/linuxport.cpp
@@ -32,6 +32,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <unistd.h>
 
 #include <linux/rtnetlink.h>