1 files changed, 1 insertions, 0 deletions

diff --git a/gtk-gui.c b/gtk-gui.c
index ee99f01eb..a20954dd6 100644
--- a/gtk-gui.c
+++ b/gtk-gui.c
@@ -7,6 +7,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <time.h>
+#include <unistd.h>
 
 #include "dive.h"
 #include "divelist.h"