diff --git a/CHANGELOG.md b/CHANGELOG.md
index e87dee655..d15974d0a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -82,6 +82,15 @@ et négociation HTTP/3 côté client PostIt.
   désactivé (grisé) et inerte au clic. Corrigé en
   `$parent[ContentPage].((vm:XxxViewModel)DataContext).Cmd` (syntaxe
   déjà en vigueur dans `CirclesPage` / `EstimateListPage`).
+* [Yavsc.Blogs] La suppression d'un fichier (`DELETE api/v1/fs/{name}`)
+  renvoyait un 40x alors que le fichier était bien supprimé du disque.
+  `DeleteUserDirOrFile` (et `DeleteUserFile`) lisaient
+  `FileInfo.Length` **après** `fi.Delete()` ; or `FileInfo.Length`
+  lève `FileNotFoundException` une fois le fichier disparu — le `catch`
+  du contrôleur transformait cette exception en 400, d'où le message
+  perçu « le fichier n'existe pas sur le serveur » tandis que la
+  suppression avait réussi. La taille est désormais capturée avant la
+  suppression.
 
 ## [1.0.8-rc17] - unstable
 
diff --git a/src/Yavsc.Blogs.Tests/FileSystemApiTests.cs b/src/Yavsc.Blogs.Tests/FileSystemApiTests.cs
index e67f235aa..0e36a6018 100644
--- a/src/Yavsc.Blogs.Tests/FileSystemApiTests.cs
+++ b/src/Yavsc.Blogs.Tests/FileSystemApiTests.cs
@@ -363,4 +363,35 @@ public sealed class FileSystemApiTests : IClassFixture<BlogsWebServerFixture>
 
         Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
     }
+
+    /// <summary>
+    /// Regression for the "delete returns 40x yet the file is gone"
+    /// report: <c>DeleteUserDirOrFile</c> read <c>FileInfo.Length</c>
+    /// <b>after</b> <c>fi.Delete()</c>, and <c>FileInfo.Length</c>
+    /// throws <c>FileNotFoundException</c> once the file no longer
+    /// exists. The controller's <c>catch</c> turned that into a 400
+    /// even though the file had already been removed — the user saw
+    /// "le fichier n'existe pas sur le serveur" while the delete in
+    /// fact succeeded. This test asserts a clean 200 and that the
+    /// file is gone from disk.
+    /// </summary>
+    [Fact]
+    public async Task Delete_fs_removes_the_file_and_returns_200()
+    {
+        _fixture.ResetDatabase();
+        _fixture.SeedUser("alice");
+
+        var bytes = System.Text.Encoding.UTF8.GetBytes("delete me");
+        WritePhysicalFile(_fixture, "alice", "doomed.txt", bytes);
+
+        using var http = NewClient("alice");
+        var response = await http.DeleteAsync(
+            "/api/v1/fs/doomed.txt", TestContext.Current.CancellationToken);
+        var body = await response.Content.ReadAsStringAsync(TestContext.Current.CancellationToken);
+
+        Assert.True(response.StatusCode == HttpStatusCode.OK,
+            $"Expected 200, got {(int)response.StatusCode} ({response.StatusCode}): {body}");
+        Assert.False(File.Exists(PhysicalFile(_fixture, "alice", "doomed.txt")),
+            "The file must be gone from disk after a successful delete.");
+    }
 }
\ No newline at end of file
diff --git a/src/Yavsc.Server/Helpers/FileSystemHelpers.cs b/src/Yavsc.Server/Helpers/FileSystemHelpers.cs
index 762c18f36..e0d5b8b9d 100644
--- a/src/Yavsc.Server/Helpers/FileSystemHelpers.cs
+++ b/src/Yavsc.Server/Helpers/FileSystemHelpers.cs
@@ -70,8 +70,12 @@ namespace Yavsc.Server.Helpers
             var root = Path.Combine(siteSettings.Blog, user.UserName);
             var fi = new FileInfo(Path.Combine(root, fileName));
             if (!fi.Exists) return;
+            // Capture the length BEFORE deleting: FileInfo.Length throws
+            // FileNotFoundException once the file is gone, which would
+            // surface as a 400 even though the delete already succeeded.
+            var length = fi.Length;
             fi.Delete();
-            user.DiskUsage -= fi.Length;
+            user.DiskUsage -= length;
         }
 
         public static FsOperationInfo DeleteUserDirOrFile(this ApplicationUser user, string dirName, SiteSettings siteSettings)
@@ -85,8 +89,15 @@ namespace Yavsc.Server.Helpers
             {
                 var fi = new FileInfo(Path.Combine(root, dirName));
                 if (!fi.Exists) return new FsOperationInfo { Done = false, ErrorCode = ErrorCode.NotFound, ErrorMessage = "non existent" };
+                // Capture the length BEFORE deleting: FileInfo.Length
+                // throws FileNotFoundException once the file is gone, so
+                // reading it after fi.Delete() would throw — the caller's
+                // catch turns that into a 400 even though the file was
+                // already removed (the user sees "file does not exist"
+                // while the delete in fact succeeded).
+                var length = fi.Length;
                 fi.Delete();
-                user.DiskUsage -= fi.Length;
+                user.DiskUsage -= length;
             }
             else
             {