diff --git a/runtime/vm/timeline.cc b/runtime/vm/timeline.cc
index 929de7fc4a2..669a1a39193 100644
--- a/runtime/vm/timeline.cc
+++ b/runtime/vm/timeline.cc
@@ -519,19 +519,15 @@ TimelineEvent::~TimelineEvent() {
 }
 
 void TimelineEvent::Reset() {
-  timestamp0_ = 0;
-  timestamp1_or_id_ = 0;
-  flow_id_count_ = 0;
-  flow_ids_.reset();
-  state_ = 0;
   if (owns_label() && label_ != nullptr) {
     free(const_cast<char*>(label_));
   }
-  label_ = nullptr;
-  stream_ = nullptr;
+  state_ = 0;
   thread_ = OSThread::kInvalidThreadId;
-  isolate_id_ = ILLEGAL_ISOLATE_ID;
-  isolate_group_id_ = ILLEGAL_ISOLATE_GROUP_ID;
+  isolate_id_ = ILLEGAL_PORT;
+  isolate_group_id_ = 0;
+  stream_ = nullptr;
+  label_ = nullptr;
   arguments_.Free();
   set_event_type(kNone);
   set_pre_serialized_args(false);