diff --git a/include/fastcgi++/email.hpp b/include/fastcgi++/email.hpp
index 406ee31..26f6b12 100644
--- a/include/fastcgi++/email.hpp
+++ b/include/fastcgi++/email.hpp
@@ -49,6 +49,8 @@ namespace Fastcgipp
         class Email_base
         {
         public:
+            virtual ~Email_base() = default;
+
             //! %Email message data
             struct DataRef
             {
diff --git a/include/fastcgi++/manager.hpp b/include/fastcgi++/manager.hpp
index 153dba9..38f575b 100644
--- a/include/fastcgi++/manager.hpp
+++ b/include/fastcgi++/manager.hpp
@@ -70,7 +70,7 @@ namespace Fastcgipp
          */
         Manager_base(unsigned threads);
 
-        ~Manager_base();
+        virtual ~Manager_base();
 
         //! Call from any thread to terminate the Manager
         /*!
diff --git a/include/fastcgi++/request.hpp b/include/fastcgi++/request.hpp
index 80842c7..6f2a660 100644
--- a/include/fastcgi++/request.hpp
+++ b/include/fastcgi++/request.hpp
@@ -244,7 +244,7 @@ namespace Fastcgipp
          * @param[in] bytesReceived Amount of bytes received in this FastCGI
          *                          record
          */
-        virtual void inHandler(int bytesReceived)
+        virtual void inHandler(int /*bytesReceived*/)
         {}
 
         //! Process custom POST data
diff --git a/include/fastcgi++/webstreambuf.hpp b/include/fastcgi++/webstreambuf.hpp
index ec0f272..cba650a 100644
--- a/include/fastcgi++/webstreambuf.hpp
+++ b/include/fastcgi++/webstreambuf.hpp
@@ -238,6 +238,8 @@ namespace Fastcgipp
         WebStreambuf():
             m_encoding(Encoding::NONE)
         {}
+
+        ~WebStreambuf() = default;
     };
 }