diff --git a/Net/include/Poco/Net/IPAddress.h b/Net/include/Poco/Net/IPAddress.h
index 144aa09e2..8dc290c65 100644
--- a/Net/include/Poco/Net/IPAddress.h
+++ b/Net/include/Poco/Net/IPAddress.h
@@ -519,9 +519,9 @@ inline char* IPAddress::storage()
 } } // namespace Poco::Net
 
 
-Poco::BinaryWriter& Net_API operator << (Poco::BinaryWriter& writer, const Poco::Net::IPAddress& value);
-Poco::BinaryReader& Net_API operator >> (Poco::BinaryReader& reader, Poco::Net::IPAddress& value);
-std::ostream& Net_API operator << (std::ostream& ostr, const Poco::Net::IPAddress& addr);
+Net_API Poco::BinaryWriter& operator << (Poco::BinaryWriter& writer, const Poco::Net::IPAddress& value);
+Net_API Poco::BinaryReader& operator >> (Poco::BinaryReader& reader, Poco::Net::IPAddress& value);
+Net_API std::ostream& operator << (std::ostream& ostr, const Poco::Net::IPAddress& addr);
 
 
 #endif // Net_IPAddress_INCLUDED
diff --git a/Net/include/Poco/Net/NetworkInterface.h b/Net/include/Poco/Net/NetworkInterface.h
index 22dc96e45..d0f513567 100644
--- a/Net/include/Poco/Net/NetworkInterface.h
+++ b/Net/include/Poco/Net/NetworkInterface.h
@@ -343,7 +343,7 @@ inline bool NetworkInterface::operator == (const NetworkInterface& other) const
 } } // namespace Poco::Net
 
 
-std::ostream& Net_API operator << (std::ostream& ostr, const Poco::Net::NetworkInterface::MACAddress& addr);
+Net_API std::ostream& operator << (std::ostream& ostr, const Poco::Net::NetworkInterface::MACAddress& addr);
 
 
 #endif // POCO_NET_HAS_INTERFACE
diff --git a/Net/include/Poco/Net/SocketAddress.h b/Net/include/Poco/Net/SocketAddress.h
index d377d2d44..ee1029ed4 100644
--- a/Net/include/Poco/Net/SocketAddress.h
+++ b/Net/include/Poco/Net/SocketAddress.h
@@ -281,9 +281,9 @@ inline bool SocketAddress::operator != (const SocketAddress& socketAddress) cons
 } } // namespace Poco::Net
 
 
-Poco::BinaryWriter& Net_API operator << (Poco::BinaryWriter& writer, const Poco::Net::SocketAddress& value);
-Poco::BinaryReader& Net_API operator >> (Poco::BinaryReader& reader, Poco::Net::SocketAddress& value);
-std::ostream& Net_API operator << (std::ostream& ostr, const Poco::Net::SocketAddress& address);
+Net_API Poco::BinaryWriter& operator << (Poco::BinaryWriter& writer, const Poco::Net::SocketAddress& value);
+Net_API Poco::BinaryReader& operator >> (Poco::BinaryReader& reader, Poco::Net::SocketAddress& value);
+Net_API std::ostream& operator << (std::ostream& ostr, const Poco::Net::SocketAddress& address);
 
 
 #endif // Net_SocketAddress_INCLUDED