diff --git a/Foundation/include/Poco/BufferedBidirectionalStreamBuf.h b/Foundation/include/Poco/BufferedBidirectionalStreamBuf.h
index fa0c95765..49d465fe2 100644
--- a/Foundation/include/Poco/BufferedBidirectionalStreamBuf.h
+++ b/Foundation/include/Poco/BufferedBidirectionalStreamBuf.h
@@ -167,6 +167,9 @@ private:
 //
 // We provide an instantiation for char
 //
+#if defined(_WIN32) && defined(POCO_DLL) && !defined(Foundation_EXPORTS) // See #921
+template class Foundation_API BasicBufferedBidirectionalStreamBuf<char, std::char_traits<char> >;
+#endif
 typedef BasicBufferedBidirectionalStreamBuf<char, std::char_traits<char> > BufferedBidirectionalStreamBuf;
 
 
diff --git a/Foundation/include/Poco/BufferedStreamBuf.h b/Foundation/include/Poco/BufferedStreamBuf.h
index 7c9c00616..5c19c468a 100644
--- a/Foundation/include/Poco/BufferedStreamBuf.h
+++ b/Foundation/include/Poco/BufferedStreamBuf.h
@@ -159,6 +159,9 @@ private:
 //
 // We provide an instantiation for char
 //
+#if defined(_WIN32) && defined(POCO_DLL) && !defined(Foundation_EXPORTS) // See #921
+template class Foundation_API BasicBufferedStreamBuf<char, std::char_traits<char> >;
+#endif
 typedef BasicBufferedStreamBuf<char, std::char_traits<char> > BufferedStreamBuf;
 
 
diff --git a/Foundation/include/Poco/UnbufferedStreamBuf.h b/Foundation/include/Poco/UnbufferedStreamBuf.h
index 40ca084b1..073fcffb8 100644
--- a/Foundation/include/Poco/UnbufferedStreamBuf.h
+++ b/Foundation/include/Poco/UnbufferedStreamBuf.h
@@ -165,6 +165,9 @@ private:
 //
 // We provide an instantiation for char
 //
+#if defined(_WIN32) && defined(POCO_DLL) && !defined(Foundation_EXPORTS) // See #921
+template class Foundation_API BasicUnbufferedStreamBuf<char, std::char_traits<char> >;
+#endif
 typedef BasicUnbufferedStreamBuf<char, std::char_traits<char> > UnbufferedStreamBuf;