diff --git a/descriptors.h b/descriptors.h
index bb45e6e..3ee0b8b 100644
--- a/descriptors.h
+++ b/descriptors.h
@@ -29,6 +29,7 @@
 #define __DESCRIPTORS_H__
 
 #include "extended_frontend.h"
+#include "time.h"
 
 /******************************************************************************
  * descriptor ids as defined by standards.
