diff --git a/tmux.c b/tmux.c
index 94d97f92..5514a9af 100644
--- a/tmux.c
+++ b/tmux.c
@@ -27,6 +27,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <time.h>
 
 #include "tmux.h"