diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index bd8a0f69..25a841d8 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -23006,13 +23006,13 @@ FullMessageId MessagesManager::on_send_message_success(int64 random_id, MessageI
     LOG(ERROR) << "Receive " << new_message_id << " as sent message from " << source;
     on_send_message_fail(
         random_id,
-        Status::Error(500, "Internal server error: receive invalid message identifier as sent message identifier"));
+        Status::Error(500, "Internal Server Error: receive invalid message identifier as sent message identifier"));
     return {};
   }
   if (new_message_id.is_yet_unsent()) {
     LOG(ERROR) << "Receive " << new_message_id << " as sent message from " << source;
     on_send_message_fail(random_id,
-                         Status::Error(500, "Internal server error: receive yet unsent message as sent message"));
+                         Status::Error(500, "Internal Server Error: receive yet unsent message as sent message"));
     return {};
   }
 
@@ -23028,7 +23028,7 @@ FullMessageId MessagesManager::on_send_message_success(int64 random_id, MessageI
 
   if (new_message_id.is_local() && dialog_id.get_type() != DialogType::SecretChat) {
     LOG(ERROR) << "Receive " << new_message_id << " as sent message from " << source;
-    on_send_message_fail(random_id, Status::Error(500, "Internal server error: receive local as sent message"));
+    on_send_message_fail(random_id, Status::Error(500, "Internal Server Error: receive local as sent message"));
     return {};
   }
 
diff --git a/td/telegram/StickersManager.cpp b/td/telegram/StickersManager.cpp
index 33509865..46b57b5c 100644
--- a/td/telegram/StickersManager.cpp
+++ b/td/telegram/StickersManager.cpp
@@ -2242,7 +2242,7 @@ StickerSetId StickersManager::on_get_messages_sticker_set(StickerSetId sticker_s
   }
   if (sticker_set_id.is_valid() && sticker_set_id != set_id) {
     LOG(ERROR) << "Expected " << sticker_set_id << ", but receive " << set_id << " from " << source;
-    on_load_sticker_set_fail(sticker_set_id, Status::Error(500, "Internal server error"));
+    on_load_sticker_set_fail(sticker_set_id, Status::Error(500, "Internal Server Error"));
     return StickerSetId();
   }
 
diff --git a/tdnet/td/net/HttpReader.cpp b/tdnet/td/net/HttpReader.cpp
index 4857d1f8..83d806cc 100644
--- a/tdnet/td/net/HttpReader.cpp
+++ b/tdnet/td/net/HttpReader.cpp
@@ -798,7 +798,7 @@ Status HttpReader::save_file_part(BufferSlice &&file_part) {
   auto result_written = temp_file_.write(file_part.as_slice());
   if (result_written.is_error() || result_written.ok() != file_part.size()) {
     clean_temporary_file();
-    return Status::Error(500, "Internal server error: can't upload the file");
+    return Status::Error(500, "Internal Server Error: can't upload the file");
   }
   return Status::OK();
 }