diff --git a/panda/src/pstatclient/pStatClient.h b/panda/src/pstatclient/pStatClient.h
index aabc0fb8f6..56bd0d2a1b 100644
--- a/panda/src/pstatclient/pStatClient.h
+++ b/panda/src/pstatclient/pStatClient.h
@@ -216,7 +216,6 @@ private:
     double _next_packet;
 
     bool _thread_active;
-    BitArray _active_collectors;  // no longer used.
 
     // This mutex is used to protect writes to _frame_data for this particular
     // thread, as well as writes to the _per_thread data for this particular