diff --git a/mythtv/libs/libmythtv/mpeg/mpegstreamdata.cpp b/mythtv/libs/libmythtv/mpeg/mpegstreamdata.cpp
index d69c6ef1c5e..db91c4850c4 100644
--- a/mythtv/libs/libmythtv/mpeg/mpegstreamdata.cpp
+++ b/mythtv/libs/libmythtv/mpeg/mpegstreamdata.cpp
@@ -1068,6 +1068,8 @@ bool MPEGStreamData::ProcessTSPacket(const TSPacket& tspacket)
 
     if (IsWritingPID(tspacket.PID()))
     {
+        QMutexLocker locker(&m_listenerLock);
+
         for (auto & listener : m_tsWritingListeners)
             listener->ProcessTSPacket(tspacket);
     }