diff --git a/repos/base/src/core/include/trace/session_component.h b/repos/base/src/core/include/trace/session_component.h
index 3fdff80f58..c15cc696e8 100644
--- a/repos/base/src/core/include/trace/session_component.h
+++ b/repos/base/src/core/include/trace/session_component.h
@@ -41,7 +41,6 @@ class Genode::Trace::Session_component
 		Sliced_heap                  _md_alloc { _ram, _local_rm };
 		Tslab<Trace::Subject, 4096>  _subjects_slab;
 		Tslab<Trace::Policy, 4096>   _policies_slab;
-		unsigned               const _parent_levels;
 		Source_registry             &_sources;
 		Policy_registry             &_policies;
 		Subject_registry             _subjects;
diff --git a/repos/base/src/core/trace_session_component.cc b/repos/base/src/core/trace_session_component.cc
index 183ce56333..fd86783754 100644
--- a/repos/base/src/core/trace_session_component.cc
+++ b/repos/base/src/core/trace_session_component.cc
@@ -173,7 +173,7 @@ Session_component::Session_component(Rpc_entrypoint  &ep,
                                      Ram_allocator   &ram,
                                      Region_map      &local_rm,
                                      size_t           arg_buffer_size,
-                                     unsigned         parent_levels,
+                                     unsigned         /* parent_levels */,
                                      Source_registry &sources,
                                      Policy_registry &policies)
 :
@@ -182,7 +182,6 @@ Session_component::Session_component(Rpc_entrypoint  &ep,
 	_local_rm(local_rm),
 	_subjects_slab(&_md_alloc),
 	_policies_slab(&_md_alloc),
-	_parent_levels(parent_levels),
 	_sources(sources),
 	_policies(policies),
 	_subjects(_subjects_slab, _sources),