diff --git a/listenarr.application/Audiobooks/Files/AudiobookFileService.PhysicalGeneration.cs b/listenarr.application/Audiobooks/Files/AudiobookFileService.PhysicalGeneration.cs
index 3dad98b99..964c765b3 100644
--- a/listenarr.application/Audiobooks/Files/AudiobookFileService.PhysicalGeneration.cs
+++ b/listenarr.application/Audiobooks/Files/AudiobookFileService.PhysicalGeneration.cs
@@ -274,10 +274,10 @@ private static AudiobookFile CreatePhysicalGenerationSnapshot(
         string? source,
         bool replaceMetadata)
     {
-        var fileInfo = new FileInfo(registrationLease.MetadataPath);
         var replacement = AudiobookFile.CreateUnresolved(currentFile.Path);
         replacement.AudiobookId = currentFile.AudiobookId;
-        replacement.Size = fileInfo.Exists ? fileInfo.Length : currentFile.Size;
+        replacement.Size = TryGetRegisteredFileLength(registrationLease.MetadataPath)
+            ?? currentFile.Size;
         replacement.DurationSeconds = replaceMetadata
             ? metadata?.Duration.TotalSeconds
             : Math.Abs(metadata?.Duration.TotalSeconds ?? 0) > double.Epsilon
diff --git a/listenarr.application/Audiobooks/Files/AudiobookFileService.cs b/listenarr.application/Audiobooks/Files/AudiobookFileService.cs
index 823fe2f2c..0bdcae55d 100644
--- a/listenarr.application/Audiobooks/Files/AudiobookFileService.cs
+++ b/listenarr.application/Audiobooks/Files/AudiobookFileService.cs
@@ -327,10 +327,9 @@ private async Task<bool> EnsureAudiobookFileCoreAsync(
                     cacheIdentity,
                     filePath);
 
-                var fi = new FileInfo(metadataPath);
                 var fileRecord = AudiobookFile.CreateUnresolved(filePath);
                 fileRecord.AudiobookId = audiobook.Id;
-                fileRecord.Size = fi.Exists ? fi.Length : null;
+                fileRecord.Size = TryGetRegisteredFileLength(metadataPath);
                 fileRecord.Source = source;
                 fileRecord.CreatedAt = DateTime.UtcNow;
                 fileRecord.DurationSeconds = meta?.Duration.TotalSeconds;
@@ -442,6 +441,32 @@ private static string ResolveAbsolutePath(string? path) =>
                 ? string.Empty
                 : FileSystemPathIdentity.ResolveNativeAbsolutePath(path);
 
+        /// <summary>
+        /// Read the byte length of the file behind a registration metadata path.
+        /// The pinned lease's metadata path is a /proc/self/fd magic link on
+        /// Linux, and FileSystemInfo reads the link inode itself, whose reported
+        /// size is a constant 64 — not the file's length. Opening the path
+        /// follows the link to the pinned file, so the stream length is the real
+        /// size of the exact object the lease holds open.
+        /// </summary>
+        private static long? TryGetRegisteredFileLength(string metadataPath)
+        {
+            try
+            {
+                using var stream = new FileStream(
+                    metadataPath,
+                    FileMode.Open,
+                    FileAccess.Read,
+                    FileShare.ReadWrite | FileShare.Delete);
+                return stream.Length;
+            }
+            catch (Exception exception) when (exception is IOException
+                or UnauthorizedAccessException or NotSupportedException)
+            {
+                return null;
+            }
+        }
+
         private void LogClaimRejection(
             int audiobookId,
             string path,