1 files changed, 1 insertions, 0 deletions
diff --git a/include/iobuf.h b/include/iobuf.h
index 363b09e5b..e5e9ba94f 100644
--- a/include/iobuf.h
+++ b/include/iobuf.h
@@ -32,6 +32,7 @@
 #define IOBUFCTRL_UNDERFLOW 3
 #define IOBUFCTRL_FLUSH     4
 #define IOBUFCTRL_DESC	    5
+#define IOBUFCTRL_CANCEL    6
 #define IOBUFCTRL_USER	    16
 
 typedef struct iobuf_struct *IOBUF;