diff --git a/tracetools/include/tracetools/tracetools.h b/tracetools/include/tracetools/tracetools.h
index 1f363eb..439f520 100644
--- a/tracetools/include/tracetools/tracetools.h
+++ b/tracetools/include/tracetools/tracetools.h
@@ -54,7 +54,8 @@ void TRACEPOINT(
   const void * node_handle,
   const void * rmw_handle,
   const void * subscription_handle,
-  const char * topic_name);
+  const char * topic_name,
+  const size_t depth);
 
 /**
  * tp: rclcpp_subscription_callback_added
diff --git a/tracetools/lttng/tp_call.tp b/tracetools/lttng/tp_call.tp
index 9bdc7a7..882b290 100644
--- a/tracetools/lttng/tp_call.tp
+++ b/tracetools/lttng/tp_call.tp
@@ -54,13 +54,15 @@ TRACEPOINT_EVENT(
         const void *, node_handle_arg,
         const void *, rmw_handle_arg,
         const void *, subscription_handle_arg,
-        const char *, topic_name_arg
+        const char *, topic_name_arg,
+        const size_t, depth_arg
     ),
     TP_FIELDS(
         ctf_integer_hex(const void *, node_handle, node_handle_arg)
         ctf_integer_hex(const void *, rmw_handle, rmw_handle_arg)
         ctf_integer_hex(const void *, subscription_handle, subscription_handle_arg)
         ctf_string(topic_name, topic_name_arg)
+        ctf_integer(const size_t, depth, depth_arg)
     )
 )
 
diff --git a/tracetools/src/tracetools.c b/tracetools/src/tracetools.c
index 13ea3ee..c2d1aa5 100644
--- a/tracetools/src/tracetools.c
+++ b/tracetools/src/tracetools.c
@@ -51,9 +51,10 @@ void TRACEPOINT(
   const void * node_handle,
   const void * rmw_handle,
   const void * subscription_handle,
-  const char * topic_name)
+  const char * topic_name,
+  const size_t depth)
 {
-  CONDITIONAL_TP(ros2, rcl_subscription_init, node_handle, rmw_handle, subscription_handle, topic_name);
+  CONDITIONAL_TP(ros2, rcl_subscription_init, node_handle, rmw_handle, subscription_handle, topic_name, depth);
 }
 
 void TRACEPOINT(