diff --git a/Lagrange.Core/Internal/Service/Message/ImageGroupUploadService.cs b/Lagrange.Core/Internal/Service/Message/ImageGroupUploadService.cs
index b34dce660..dd9c5932e 100644
--- a/Lagrange.Core/Internal/Service/Message/ImageGroupUploadService.cs
+++ b/Lagrange.Core/Internal/Service/Message/ImageGroupUploadService.cs
@@ -97,7 +97,7 @@ protected override bool Build(ImageGroupUploadEvent input, BotKeystore keystore,
                         // so we only implement the default summary for sub type 1
                         // and Tencent implements the others based on the default values.
                         TextSummary = input.Entity.Summary ?? (input.Entity.SubType == 1 ? "[\u52a8\u753b\u8868\u60c5]" : null!),
-                        C2c = new PicExtBizInfoC2c
+                        Troop = new PicExtBizInfoTroop
                         {
                             SubType = (uint)input.Entity.SubType
                         }
@@ -131,4 +131,4 @@ protected override bool Parse(Span<byte> input, BotKeystore keystore, BotAppInfo
         extraEvents = null;
         return true;
     }
-}
\ No newline at end of file
+}