diff --git a/src/broker/Manager.cc b/src/broker/Manager.cc
index adbf494878..e5e6c66e75 100644
--- a/src/broker/Manager.cc
+++ b/src/broker/Manager.cc
@@ -1272,7 +1272,7 @@ void Manager::ProcessMessage(std::string_view topic, broker::zeek::Event& ev) {
                                      expected_type->GetName().c_str());
             }
 
-            reporter->Warning("failed to convert remote event '%s' arg #%zu, %s", std::string{name}.c_str(), i,
+            reporter->Warning("failed to convert remote event '%s' arg #%zu, %s", std::string{name}.c_str(), i + 1,
                               msg_addl.c_str());
 
             // If we got a vector and expected a function this is
diff --git a/testing/btest/Baseline/language.closure-sending-naming/recv.recv.error b/testing/btest/Baseline/language.closure-sending-naming/recv.recv.error
index c0dcbdf313..58147ef0bc 100644
--- a/testing/btest/Baseline/language.closure-sending-naming/recv.recv.error
+++ b/testing/btest/Baseline/language.closure-sending-naming/recv.recv.error
@@ -1,5 +1,5 @@
 ### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
-warning: failed to convert remote event 'ping' arg #1, got vector, expected func
+warning: failed to convert remote event 'ping' arg #2, got vector, expected func
 warning: when sending functions the receiver must have access to a version of that function.
 For anonymous functions, that function must have the same body.
 received termination signal