diff --git a/src/XrdApps/XrdClRecordPlugin/XrdClReplay.cc b/src/XrdApps/XrdClRecordPlugin/XrdClReplay.cc
index 98f686698a9..b5abbd7b386 100644
--- a/src/XrdApps/XrdClRecordPlugin/XrdClReplay.cc
+++ b/src/XrdApps/XrdClRecordPlugin/XrdClReplay.cc
@@ -87,7 +87,7 @@ class BufferPool
     //--------------------------------------------------------------------------
     void Reclaim( size_t length )
     {
-      std::unique_lock<std::mutex> lck;
+      std::unique_lock<std::mutex> lck(mtx);
       available += length;
       cv.notify_all();
     }