--- openflow-2009-06-29.h	2015-07-23 09:54:15.652479301 -0700
+++ openflow-2009-06-16.h	2015-07-23 09:54:15.656479301 -0700
@@ -566,7 +566,8 @@
     uint8_t pad[1];           /* Align to 32-bits. */
 
     uint32_t duration;        /* Time flow was alive in seconds. */
-    uint8_t pad2[4];          /* Align to 64-bits. */
+    uint16_t idle_timeout;    /* Idle time before discarding (seconds). */
+    uint8_t pad2[2];          /* Align to 64-bits. */
     uint64_t packet_count;    
     uint64_t byte_count;
 };