diff --git a/src/script_opt/FuncInfo.cc b/src/script_opt/FuncInfo.cc
index e8a073c28f..2516d1bd44 100644
--- a/src/script_opt/FuncInfo.cc
+++ b/src/script_opt/FuncInfo.cc
@@ -72,6 +72,11 @@ static std::unordered_map<std::string, unsigned int> func_attrs = {
     {"Analyzer::__register_for_port", ATTR_NO_SCRIPT_SIDE_EFFECTS},
     {"Analyzer::__schedule_analyzer", ATTR_NO_SCRIPT_SIDE_EFFECTS},
     {"Analyzer::__tag", ATTR_FOLDABLE},
+    {"Cluster::Backend::__init", ATTR_NO_SCRIPT_SIDE_EFFECTS},
+    {"Cluster::__subscribe", ATTR_NO_SCRIPT_SIDE_EFFECTS},
+    {"Cluster::__unsubscribe", ATTR_NO_SCRIPT_SIDE_EFFECTS},
+    {"Cluster::make_event", ATTR_NO_SCRIPT_SIDE_EFFECTS},
+    {"Cluster::publish", ATTR_NO_SCRIPT_SIDE_EFFECTS},
     {"FileExtract::__set_limit", ATTR_NO_SCRIPT_SIDE_EFFECTS},
     {"Files::__add_analyzer", ATTR_NO_SCRIPT_SIDE_EFFECTS},
     {"Files::__analyzer_enabled", ATTR_NO_ZEEK_SIDE_EFFECTS},
diff --git a/testing/btest/Baseline.zam/opt.ZAM-bif-tracking/output b/testing/btest/Baseline.zam/opt.ZAM-bif-tracking/output
index 542c7fe5c1..6f645f9525 100644
--- a/testing/btest/Baseline.zam/opt.ZAM-bif-tracking/output
+++ b/testing/btest/Baseline.zam/opt.ZAM-bif-tracking/output
@@ -1,2 +1,2 @@
 ### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
-534 seen BiFs, 0 unseen BiFs (), 0 new BiFs ()
+539 seen BiFs, 0 unseen BiFs (), 0 new BiFs ()
diff --git a/testing/btest/opt/ZAM-bif-tracking.zeek b/testing/btest/opt/ZAM-bif-tracking.zeek
index 339d729e6f..e173410674 100644
--- a/testing/btest/opt/ZAM-bif-tracking.zeek
+++ b/testing/btest/opt/ZAM-bif-tracking.zeek
@@ -95,6 +95,11 @@ global known_BiFs = set(
 	"Broker::__vector_size",
 	"Broker::make_event",
 	"Broker::publish",
+	"Cluster::Backend::__init",
+	"Cluster::__subscribe",
+	"Cluster::__unsubscribe",
+	"Cluster::make_event",
+	"Cluster::publish",
 	"Cluster::publish_hrw",
 	"Cluster::publish_rr",
 	"FileExtract::__set_limit",