diff --git a/arbor/merge_events.cpp b/arbor/merge_events.cpp
index 04355188ee4a8049d3c930b65c4bec8f7b11fb8f..53dd901ffb5377f088ae645b088d6ef57e3a7060 100644
--- a/arbor/merge_events.cpp
+++ b/arbor/merge_events.cpp
@@ -147,13 +147,11 @@ const spike_event& tourney_tree::event(unsigned i) const {
 } // namespace impl
 
 void tree_merge_events(std::vector<event_span>& sources, pse_vector& out) {
-    PE(communication_enqueue_tree);
     impl::tourney_tree tree(sources);
     while (!tree.empty()) {
         out.push_back(tree.head());
         tree.pop();
     }
-    PL();
 }
 
 } // namespace arb