1 files changed, 1 insertions, 0 deletions

diff --git a/monitor.c b/monitor.c
index b3ccde01..364bd231 100644
--- a/monitor.c
+++ b/monitor.c
@@ -43,6 +43,7 @@
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 #ifdef SKEY
 #include <skey.h>