diff --git a/src/vnet/session-apps/echo_server.c b/src/vnet/session-apps/echo_server.c
index a4afc5d..e79e838 100644
--- a/src/vnet/session-apps/echo_server.c
+++ b/src/vnet/session-apps/echo_server.c
@@ -96,7 +96,7 @@
 }
 
 int
-echo_server_add_segment_callback (u32 client_index, const ssvm_private_t * sp)
+echo_server_add_segment_callback (u32 client_index, u64 segment_handle)
 {
   /* New heaps may be added */
   return 0;