diff --git a/td/telegram/files/PartsManager.cpp b/td/telegram/files/PartsManager.cpp
index 04e10da6..7122e6b2 100644
--- a/td/telegram/files/PartsManager.cpp
+++ b/td/telegram/files/PartsManager.cpp
@@ -62,6 +62,10 @@ Status PartsManager::init(int64 size, bool is_size_final, size_t part_size, cons
 
   if (part_size != 0) {
     part_size_ = part_size;
+    if (use_part_count_limit_ && (size_ + part_size_ - 1) / part_size_ > MAX_PART_COUNT) {
+      return Status::Error(PSLICE() << "Should restart load with bigger part_size " << tag("part_size_", part_size_)
+                                    << tag("size", size_));
+    }
   } else {
     // TODO choose part_size_ depending on size
     part_size_ = 64 * (1 << 10);