diff --git a/tools/ld-discmap/discmap.cpp b/tools/ld-discmap/discmap.cpp
index 4ff0d8ad1..7a3159d8e 100644
--- a/tools/ld-discmap/discmap.cpp
+++ b/tools/ld-discmap/discmap.cpp
@@ -735,7 +735,7 @@ qint32 DiscMap::getSecondFieldAudioDataLength(qint32 frameNumber) const
         qDebug() << "getSecondFieldAudioDataLength out of frameNumber range";
         return false;
     }
-    return ldDecodeMetaData->getFieldPcmAudioLength(m_frames[frameNumber].firstField());
+    return ldDecodeMetaData->getFieldPcmAudioLength(m_frames[frameNumber].secondField());
 }
 
 // Save the target metadata from the disc map