diff --git a/tdutils/td/utils/FloodControlFast.h b/tdutils/td/utils/FloodControlFast.h
index 22f206efd..59f32f55d 100644
--- a/tdutils/td/utils/FloodControlFast.h
+++ b/tdutils/td/utils/FloodControlFast.h
@@ -7,54 +7,9 @@
 #pragma once
 
 #include "td/utils/common.h"
-#include "td/utils/TimedStat.h"
 
 namespace td {
 
-class FloodControlBucket {
- public:
-  FloodControlBucket(double duration, double count)
-      : max_capacity_(count), speed_(count / duration), volume_(max_capacity_) {
-  }
-
-  void add_event(double now, double size = 1) {
-    CHECK(now >= wakeup_at_);
-    update_volume(now);
-    if (volume_ >= size) {
-      volume_ -= size;
-      return;
-    }
-    size -= volume_;
-    volume_ = 0;
-    wakeup_at_ = volume_at_ + size / speed_;
-    volume_at_ = wakeup_at_;
-  }
-  double get_wakeup_at() const {
-    return wakeup_at_;
-  }
-
-  void clear_events() {
-    volume_ = max_capacity_;
-    volume_at_ = 0;
-    wakeup_at_ = 0;
-  }
-
- private:
-  double max_capacity_{1};
-  double speed_{1};
-  double volume_{max_capacity_};
-
-  double volume_at_{0};
-  double wakeup_at_{0};
-
-  void update_volume(double now) {
-    CHECK(now >= volume_at_);
-    auto passed = now - volume_at_;
-    volume_ = td::min(volume_ + passed * speed_, max_capacity_);
-    volume_at_ = now;
-  }
-};
-
 class FloodControlFast {
  public:
   void add_event(double now) {
@@ -80,8 +35,53 @@ class FloodControlFast {
   }
 
  private:
+  class FloodControlBucket {
+   public:
+    FloodControlBucket(double duration, double count)
+        : max_capacity_(count - 1), speed_(count / duration), volume_(max_capacity_) {
+    }
+
+    void add_event(double now, double size = 1) {
+      CHECK(now >= wakeup_at_);
+      update_volume(now);
+      if (volume_ >= size) {
+        volume_ -= size;
+        return;
+      }
+      size -= volume_;
+      volume_ = 0;
+      wakeup_at_ = volume_at_ + size / speed_;
+      volume_at_ = wakeup_at_;
+    }
+
+    double get_wakeup_at() const {
+      return wakeup_at_;
+    }
+
+    void clear_events() {
+      volume_ = max_capacity_;
+      volume_at_ = 0;
+      wakeup_at_ = 0;
+    }
+
+   private:
+    const double max_capacity_{1};
+    const double speed_{1};
+    double volume_{1};
+
+    double volume_at_{0};
+    double wakeup_at_{0};
+
+    void update_volume(double now) {
+      CHECK(now >= volume_at_);
+      auto passed = now - volume_at_;
+      volume_ = td::min(volume_ + passed * speed_, max_capacity_);
+      volume_at_ = now;
+    }
+  };
+
   double wakeup_at_ = 0;
-  std::vector<FloodControlBucket> buckets_;
+  vector<FloodControlBucket> buckets_;
 };
 
 }  // namespace td
diff --git a/tdutils/test/misc.cpp b/tdutils/test/misc.cpp
index 9decb679e..c07cb6999 100644
--- a/tdutils/test/misc.cpp
+++ b/tdutils/test/misc.cpp
@@ -1249,10 +1249,13 @@ TEST(Misc, check_reset_guard) {
 TEST(FloodControl, Fast) {
   td::FloodControlFast fc;
   fc.add_limit(1, 5);
+  fc.add_limit(5, 10);
+
+  td::int32 count = 0;
   double now = 0;
   for (int i = 0; i < 100; i++) {
     now = fc.get_wakeup_at();
     fc.add_event(now);
-    LOG(INFO) << now;
+    LOG(INFO) << ++count << ": " << now;
   }
 }