diff --git a/tdutils/td/utils/buffer.h b/tdutils/td/utils/buffer.h
index 401c2bac0..975ddf3fa 100644
--- a/tdutils/td/utils/buffer.h
+++ b/tdutils/td/utils/buffer.h
@@ -147,10 +147,10 @@ class BufferSlice {
     debug_untrack();
   }
 
-  void debug_track() {
+  void debug_track() const {
     BufferAllocator::track_buffer_slice(static_cast<int64>(size()));
   }
-  void debug_untrack() {
+  void debug_untrack() const {
     BufferAllocator::track_buffer_slice(-static_cast<int64>(size()));
   }
 
@@ -214,6 +214,7 @@ class BufferSlice {
 
   BufferSlice from_slice(Slice slice) const {
     auto res = BufferSlice(BufferAllocator::create_reader(buffer_));
+    res.debug_untrack();
     res.begin_ = static_cast<size_t>(slice.ubegin() - buffer_->data_);
     res.end_ = static_cast<size_t>(slice.uend() - buffer_->data_);
     res.debug_track();
diff --git a/test/http.cpp b/test/http.cpp
index 1982c79f7..b053b8730 100644
--- a/test/http.cpp
+++ b/test/http.cpp
@@ -134,6 +134,16 @@ TEST(Http, reader) {
   SET_VERBOSITY_LEVEL(VERBOSITY_NAME(ERROR));
   auto start_mem = BufferAllocator::get_buffer_mem();
   auto start_size = BufferAllocator::get_buffer_slice_size();
+  {
+    BufferSlice a("test test");
+    BufferSlice b = std::move(a);
+    a = std::move(b);
+    BufferSlice c = a.from_slice(a);
+    CHECK(c.size() == a.size());
+  }
+  clear_thread_locals();
+  ASSERT_EQ(start_mem, BufferAllocator::get_buffer_mem());
+  ASSERT_EQ(start_size, BufferAllocator::get_buffer_slice_size());
   for (int i = 0; i < 20; i++) {
     td::ChainBufferWriter input_writer;
     auto input = input_writer.extract_reader();