diff --git a/window-client.c b/window-client.c
index 4d720960..f34d007d 100644
--- a/window-client.c
+++ b/window-client.c
@@ -21,6 +21,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 
 #include "tmux.h"