diff --git a/logging.h b/logging.h
index 3ee3e1acf0..485209adf3 100644
--- a/logging.h
+++ b/logging.h
@@ -31,6 +31,7 @@
 
 #ifdef LOG
 #include <stdarg.h>
+#include <unistd.h>
 #include <syslog.h>
 
 #undef info