diff --git a/td/telegram/files/FileManager.cpp b/td/telegram/files/FileManager.cpp
index 7d525c54..e1b7171f 100644
--- a/td/telegram/files/FileManager.cpp
+++ b/td/telegram/files/FileManager.cpp
@@ -460,7 +460,7 @@ const FullLocalFileLocation &FileView::local_location() const {
 }
 
 bool FileView::has_remote_location() const {
-  return bool(node_->remote_.full);
+  return static_cast<bool>(node_->remote_.full);
 }
 bool FileView::has_alive_remote_location() const {
   return node_->remote_.is_full_alive;
diff --git a/td/telegram/files/FileManager.h b/td/telegram/files/FileManager.h
index 34b7ab1f..f1e2d034 100644
--- a/td/telegram/files/FileManager.h
+++ b/td/telegram/files/FileManager.h
@@ -212,7 +212,7 @@ class ConstFileNodePtr {
   }
 
   explicit operator bool() const {
-    return bool(file_node_ptr_);
+    return static_cast<bool>(file_node_ptr_);
   }
   const FullRemoteFileLocation *get_remote() const {
     return file_node_ptr_.get_remote();
diff --git a/tdactor/td/actor/PromiseFuture.h b/tdactor/td/actor/PromiseFuture.h
index fcf86db0..850e8814 100644
--- a/tdactor/td/actor/PromiseFuture.h
+++ b/tdactor/td/actor/PromiseFuture.h
@@ -250,7 +250,7 @@ class CancellablePromise : public PromiseT {
     return true;
   }
   virtual bool is_cancelled() const {
-    return bool(cancellation_token_);
+    return static_cast<bool>(cancellation_token_);
   }
 
  private: