diff --git a/panda/src/dgraph/dataGraphTraverser.h b/panda/src/dgraph/dataGraphTraverser.h
index df7b8d6a8c..c163787823 100644
--- a/panda/src/dgraph/dataGraphTraverser.h
+++ b/panda/src/dgraph/dataGraphTraverser.h
@@ -38,7 +38,7 @@ class PandaNode;
 ////////////////////////////////////////////////////////////////////
 class EXPCL_PANDA DataGraphTraverser {
 PUBLISHED:
-  DataGraphTraverser(Thread *current_thread);
+  DataGraphTraverser(Thread *current_thread = Thread::get_current_thread());
   ~DataGraphTraverser();
 
   void traverse(PandaNode *node);
diff --git a/panda/src/putil/clockObject.h b/panda/src/putil/clockObject.h
index 68a4ad7576..e9421a1bcc 100644
--- a/panda/src/putil/clockObject.h
+++ b/panda/src/putil/clockObject.h
@@ -104,7 +104,7 @@ PUBLISHED:
   INLINE double get_average_frame_rate_interval() const;
   INLINE double get_average_frame_rate(Thread *current_thread = Thread::get_current_thread()) const;
 
-  void tick(Thread *current_thread);
+  void tick(Thread *current_thread = Thread::get_current_thread());
   void sync_frame_time(Thread *current_thread);
 
   INLINE bool check_errors(Thread *current_thread);