diff --git a/src/output/p_ac3.cpp b/src/output/p_ac3.cpp
index 719a72d6a..b3871a705 100644
--- a/src/output/p_ac3.cpp
+++ b/src/output/p_ac3.cpp
@@ -76,7 +76,8 @@ ac3_packetizer_c::get_frame() {
     m_packet_extensions.push_back(std::make_shared<before_adding_to_cluster_cb_packet_extension_c>([this, bytes](packet_cptr const &packet, int64_t timecode_offset) {
       mxwarn_tid(m_ti.m_fname, m_ti.m_id,
                  boost::format("%1% %2%\n")
-                 % (boost::format(Y("This audio track contains %1% bytes of invalid data which were skipped before timecode %2%.")) % bytes % format_timecode(packet->assigned_timecode - timecode_offset))
+                 % (boost::format(NY("This audio track contains %1% byte of invalid data which was skipped before timecode %2%.",
+                                     "This audio track contains %1% bytes of invalid data which were skipped before timecode %2%.", bytes)) % bytes % format_timecode(packet->assigned_timecode - timecode_offset))
                  % Y("The audio/video synchronization may have been lost."));
     }));
   }
diff --git a/src/output/p_mp3.cpp b/src/output/p_mp3.cpp
index 2adccd713..afd993a2f 100644
--- a/src/output/p_mp3.cpp
+++ b/src/output/p_mp3.cpp
@@ -67,7 +67,8 @@ mp3_packetizer_c::handle_garbage(int64_t bytes) {
     m_packet_extensions.push_back(std::make_shared<before_adding_to_cluster_cb_packet_extension_c>([this, bytes](packet_cptr const &packet, int64_t timecode_offset) {
       mxwarn_tid(m_ti.m_fname, m_ti.m_id,
                  boost::format("%1% %2%\n")
-                 % (boost::format(Y("This audio track contains %1% bytes of invalid data which were skipped before timecode %2%.")) % bytes % format_timecode(packet->assigned_timecode - timecode_offset))
+                 % (boost::format(NY("This audio track contains %1% byte of invalid data which was skipped before timecode %2%.",
+                                     "This audio track contains %1% bytes of invalid data which were skipped before timecode %2%.", bytes)) % bytes % format_timecode(packet->assigned_timecode - timecode_offset))
                  % Y("The audio/video synchronization may have been lost."));
     }));
 }