diff --git a/ttyload.h b/ttyload.h
index 7dd7756..5f782bf 100644
--- a/ttyload.h
+++ b/ttyload.h
@@ -8,6 +8,8 @@
  *
  */
 
+#include <time.h> /* because we use time_t inside this file */
+
 #define	MIN(a,b)	(((a)<(b))?(a):(b))
 #define	MAX(a,b)	(((a)>(b))?(a):(b))