diff --git a/include/rapidjson/rapidjson.h b/include/rapidjson/rapidjson.h
index c0175e1..a6d5c06 100644
--- a/include/rapidjson/rapidjson.h
+++ b/include/rapidjson/rapidjson.h
@@ -209,31 +209,6 @@ struct StreamTraits {
 	enum { copyOptimization = 0 };
 };
 
-template<typename Stream, bool = StreamTraits<Stream>::copyOptimization>
-class StreamLocalCopy;
-
-template<typename Stream>
-class StreamLocalCopy<Stream, 1> {
-public:
-	StreamLocalCopy(Stream& original) : s(original), original_(original) {}
-	~StreamLocalCopy() { original_ = s; }
-
-	Stream s; //!< copy
-private:
-	StreamLocalCopy& operator=(const StreamLocalCopy&) /* = delete */;
-	Stream& original_;
-};
-
-template<typename Stream>
-class StreamLocalCopy<Stream, 0> {
-public:
-	StreamLocalCopy(Stream& original) : s(original) {}
-
-	Stream& s; //!< reference
-private:
-	StreamLocalCopy& operator=(const StreamLocalCopy&) /* = delete */;
-};
-
 //! Put N copies of a character to a stream.
 template<typename Stream, typename Ch>
 inline void PutN(Stream& stream, Ch c, size_t n) {
diff --git a/include/rapidjson/reader.h b/include/rapidjson/reader.h
index d14a577..76fed8d 100644
--- a/include/rapidjson/reader.h
+++ b/include/rapidjson/reader.h
@@ -126,6 +126,43 @@ struct BaseReaderHandler {
 	void EndArray(SizeType) { Default(); }
 };
 
+///////////////////////////////////////////////////////////////////////////////
+// StreamLocalCopy
+
+namespace internal {
+
+template<typename Stream, int = StreamTraits<Stream>::copyOptimization>
+class StreamLocalCopy;
+
+//! Do copy optimziation.
+template<typename Stream>
+class StreamLocalCopy<Stream, 1> {
+public:
+	StreamLocalCopy(Stream& original) : s(original), original_(original) {}
+	~StreamLocalCopy() { original_ = s; }
+
+	Stream s;
+
+private:
+	StreamLocalCopy& operator=(const StreamLocalCopy&) /* = delete */;
+
+	Stream& original_;
+};
+
+//! Keep reference.
+template<typename Stream>
+class StreamLocalCopy<Stream, 0> {
+public:
+	StreamLocalCopy(Stream& original) : s(original) {}
+
+	Stream& s;
+
+private:
+	StreamLocalCopy& operator=(const StreamLocalCopy&) /* = delete */;
+};
+
+} // namespace internal
+
 ///////////////////////////////////////////////////////////////////////////////
 // SkipWhitespace
 
@@ -135,7 +172,7 @@ struct BaseReaderHandler {
 */
 template<typename InputStream>
 void SkipWhitespace(InputStream& is) {
-	StreamLocalCopy<InputStream> copy(is);
+	internal::StreamLocalCopy<InputStream> copy(is);
 	InputStream& s(copy.s);
 
 	while (s.Peek() == ' ' || s.Peek() == '\n' || s.Peek() == '\r' || s.Peek() == '\t')
@@ -450,7 +487,7 @@ private:
 	// Parse string and generate String event. Different code paths for kParseInsituFlag.
 	template<unsigned parseFlags, typename InputStream, typename Handler>
 	void ParseString(InputStream& is, Handler& handler) {
-		StreamLocalCopy<InputStream> copy(is);
+		internal::StreamLocalCopy<InputStream> copy(is);
 		InputStream& s(copy.s);
 
 		if (parseFlags & kParseInsituFlag) {
@@ -531,7 +568,7 @@ private:
 
 	template<unsigned parseFlags, typename InputStream, typename Handler>
 	void ParseNumber(InputStream& is, Handler& handler) {
-		StreamLocalCopy<InputStream> copy(is);
+		internal::StreamLocalCopy<InputStream> copy(is);
 		InputStream& s(copy.s);
 
 		// Parse minus