diff --git a/src/daemon/priv-linux.c b/src/daemon/priv-linux.c
index 68eee70..d17ec38 100644
--- a/src/daemon/priv-linux.c
+++ b/src/daemon/priv-linux.c
@@ -17,6 +17,7 @@
 
 #include "lldpd.h"
 
+#include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>