diff --git a/src/osd/ReplicatedPG.h b/src/osd/ReplicatedPG.h
index b3b936a58ef3e..66bc96827aa18 100644
--- a/src/osd/ReplicatedPG.h
+++ b/src/osd/ReplicatedPG.h
@@ -172,7 +172,6 @@ class ReplicatedPG : public PG, public PGBackend::Listener {
    * can associate itself with the correct copy operation.
    */
   typedef boost::tuple<int, CopyResults*> CopyCallbackResults;
-  class CopyCallback;
 
   friend class CopyFromCallback;
   friend class PromoteCallback;