diff --git a/auth-shadow.c b/auth-shadow.c
index 8b3160a..2190916 100644
--- a/auth-shadow.c
+++ b/auth-shadow.c
@@ -28,6 +28,7 @@
 #include <shadow.h>
 #include <stdarg.h>
 #include <string.h>
+#include <time.h>
 
 #include "key.h"
 #include "hostfile.h"