diff --git a/str.c b/str.c
index 5813606..4c7a42b 100644
--- a/str.c
+++ b/str.c
@@ -10,6 +10,7 @@
 
 #include	<stddef.h>
 #include	<wctype.h>
+#include	<time.h>
 
 #include	"str.h"
 #include	"tts.h"