diff --git a/examples/wsperf/generic.hpp b/examples/wsperf/generic.hpp
index 0b86a7f288..77e6f884b2 100644
--- a/examples/wsperf/generic.hpp
+++ b/examples/wsperf/generic.hpp
@@ -94,13 +94,13 @@ public:
     void on_open(connection_ptr con) {
         m_msg = con->get_data_message();
         
-        m_data.reserve(m_message_size);
+        m_data.reserve(static_cast<size_t>(m_message_size));
         
         if (!m_binary) {
-            fill_utf8(m_data,m_message_size,true);
+            fill_utf8(m_data,static_cast<size_t>(m_message_size),true);
             m_msg->reset(websocketpp::frame::opcode::TEXT);
         } else {
-            fill_binary(m_data,m_message_size,true);
+            fill_binary(m_data,static_cast<size_t>(m_message_size),true);
             m_msg->reset(websocketpp::frame::opcode::BINARY);
         }
         
@@ -142,7 +142,7 @@ public:
     }
 private:
     // Simulation Parameters
-    size_t              m_message_size;
+    uint64_t            m_message_size;
     uint64_t            m_message_count;
     uint64_t            m_timeout;
     bool                m_binary;
diff --git a/src/connection.hpp b/src/connection.hpp
index 4a14d054a1..a4432a0c95 100644
--- a/src/connection.hpp
+++ b/src/connection.hpp
@@ -348,7 +348,7 @@ public:
             boost::asio::async_read(
                 socket_type::get_socket(),
                 m_buf,
-                boost::asio::transfer_at_least(m_processor->get_bytes_needed()),
+                boost::asio::transfer_at_least(static_cast<size_t>(m_processor->get_bytes_needed())),
                 boost::bind(
                     &type::handle_read_frame,
                     type::shared_from_this(),
diff --git a/src/messages/data.cpp b/src/messages/data.cpp
index 4765edc10b..4e95a2c087 100644
--- a/src/messages/data.cpp
+++ b/src/messages/data.cpp
@@ -58,7 +58,7 @@ uint64_t data::process_payload(std::istream& input,uint64_t size) {
     
     if (new_size > m_payload.capacity()) {
         m_payload.reserve(std::max<size_t>(
-            new_size, static_cast<size_t>(2*m_payload.capacity())
+            static_cast<size_t>(new_size), static_cast<size_t>(2*m_payload.capacity())
         ));
     }
     
diff --git a/src/roles/client.hpp b/src/roles/client.hpp
index 68dbe0d3e4..c0ed9e8c36 100644
--- a/src/roles/client.hpp
+++ b/src/roles/client.hpp
@@ -45,6 +45,12 @@
 
 #include <iostream>
 
+#ifdef _MSC_VER
+// Disable "warning C4355: 'this' : used in base member initializer list".
+#   pragma warning(push)
+#   pragma warning(disable:4355)
+#endif
+
 using boost::asio::ip::tcp;
 
 namespace websocketpp {
@@ -531,4 +537,8 @@ void client<endpoint>::connection<connection_type>::log_open_result() {
 } // namespace role
 } // namespace websocketpp
 
+#ifdef _MSC_VER
+#   pragma warning(pop)
+#endif
+
 #endif // WEBSOCKETPP_ROLE_CLIENT_HPP
diff --git a/src/roles/server.hpp b/src/roles/server.hpp
index 3eb8f78b85..822f37a7cb 100644
--- a/src/roles/server.hpp
+++ b/src/roles/server.hpp
@@ -44,6 +44,12 @@
 #include <iostream>
 #include <stdexcept>
 
+#ifdef _MSC_VER
+// Disable "warning C4355: 'this' : used in base member initializer list".
+#   pragma warning(push)
+#   pragma warning(disable:4355)
+#endif
+
 namespace websocketpp {
 
 // Forward declarations
@@ -644,4 +650,8 @@ void server<endpoint>::connection<connection_type>::log_open_result() {
 } // namespace role 
 } // namespace websocketpp
 
+#ifdef _MSC_VER
+#   pragma warning(pop)
+#endif
+
 #endif // WEBSOCKETPP_ROLE_SERVER_HPP