diff --git a/mcrouter/lib/mc/msg.h b/mcrouter/lib/mc/msg.h
index fdc11232c..0d6dc9e45 100644
--- a/mcrouter/lib/mc/msg.h
+++ b/mcrouter/lib/mc/msg.h
@@ -265,6 +265,7 @@ enum mc_msg_flags_t {
   MC_MSG_FLAG_ASCII_INT_SERIALIZED = 0x10,
   MC_MSG_FLAG_SIZE_SPLIT = 0x20,
   MC_MSG_FLAG_KEY_CLIENT_BINDING_ENABLED = 0x40,
+  MC_MSG_FLAG_REQUEST_EXPTIME = 0x80,
   MC_MSG_FLAG_NZLIB_COMPRESSED = 0x800,
   MC_MSG_FLAG_QUICKLZ_COMPRESSED = 0x2000,
   MC_MSG_FLAG_SNAPPY_COMPRESSED = 0x4000,
@@ -308,6 +309,8 @@ static inline const char* mc_flag_to_string(const enum mc_msg_flags_t flag) {
       return "SIZE_SPLIT";
     case MC_MSG_FLAG_KEY_CLIENT_BINDING_ENABLED:
       return "MC_MSG_FLAG_KEY_CLIENT_BINDING_ENABLED";
+    case MC_MSG_FLAG_REQUEST_EXPTIME:
+      return "MC_MSG_FLAG_REQUEST_EXPTIME";
     case MC_MSG_FLAG_NZLIB_COMPRESSED:
       return "NZLIB_COMPRESSED";
     case MC_MSG_FLAG_QUICKLZ_COMPRESSED: