diff --git a/panda/src/putil/typedWritable.h b/panda/src/putil/typedWritable.h
index 0133be49ca..9b23f1eba4 100644
--- a/panda/src/putil/typedWritable.h
+++ b/panda/src/putil/typedWritable.h
@@ -69,7 +69,7 @@ PUBLISHED:
                                          const string &data,
                                          BamReader *reader = NULL);
 
-public:
+private:
   void add_bam_writer(BamWriter *writer);
   void remove_bam_writer(BamWriter *writer);