diff --git a/src/vcl/vcl_private.h b/src/vcl/vcl_private.h
index 327a7fc..af58cdc 100644
--- a/src/vcl/vcl_private.h
+++ b/src/vcl/vcl_private.h
@@ -237,6 +237,9 @@
   /** Pool of cut through registrations */
   vcl_cut_through_registration_t *cut_through_registrations;
 
+  /** Flag indicating that a new segment is being mounted */
+  volatile u32 mounting_segment;
+
 #ifdef VCL_ELOG
   /* VPP Event-logger */
   elog_main_t elog_main;
@@ -313,6 +316,12 @@
   return VCL_INVALID_SESSION_INDEX;
 }
 
+static inline u8
+vcl_session_is_ct (vcl_session_t * s)
+{
+  return (s->our_evt_q != 0);
+}
+
 static inline int
 vppcom_session_at_index (u32 session_index, vcl_session_t * volatile *sess)
 {