diff --git a/src/oatpp/core/data/stream/BufferStream.cpp b/src/oatpp/core/data/stream/BufferStream.cpp
index f29322ab..b745f099 100644
--- a/src/oatpp/core/data/stream/BufferStream.cpp
+++ b/src/oatpp/core/data/stream/BufferStream.cpp
@@ -147,7 +147,7 @@ oatpp::async::CoroutineStarter BufferOutputStream::flushToStreamAsync(const std:
       , m_stream(stream)
     {}
 
-    virtual Action act() override {
+    Action act() override {
       if(m_inlineData.currBufferPtr == nullptr) {
         m_inlineData.currBufferPtr = m_this->m_data;
         m_inlineData.bytesLeft = m_this->m_position;
diff --git a/src/oatpp/core/data/stream/Stream.cpp b/src/oatpp/core/data/stream/Stream.cpp
index 031551f8..d23ee35b 100644
--- a/src/oatpp/core/data/stream/Stream.cpp
+++ b/src/oatpp/core/data/stream/Stream.cpp
@@ -119,7 +119,7 @@ async::CoroutineStarter WriteCallback::writeExactSizeDataAsync(const void* data,
       , m_inlineData(data, size)
     {}
 
-    virtual Action act() override {
+    Action act() override {
       return m_this->writeExactSizeDataAsyncInline(m_inlineData, finish());
     }
 
diff --git a/src/oatpp/web/protocol/http/outgoing/Request.cpp b/src/oatpp/web/protocol/http/outgoing/Request.cpp
index f2f9211a..afa0803c 100644
--- a/src/oatpp/web/protocol/http/outgoing/Request.cpp
+++ b/src/oatpp/web/protocol/http/outgoing/Request.cpp
@@ -165,7 +165,7 @@ oatpp::async::CoroutineStarter Request::sendAsync(std::shared_ptr<Request> _this
       , m_headersWriteBuffer(std::make_shared<oatpp::data::stream::BufferOutputStream>())
     {}
     
-    virtual Action act() override {
+    Action act() override {
 
       v_buff_size bodySize = -1;