diff --git a/include/rapidjson/istreamwrapper.h b/include/rapidjson/istreamwrapper.h
index 412509b..9efeea2 100644
--- a/include/rapidjson/istreamwrapper.h
+++ b/include/rapidjson/istreamwrapper.h
@@ -87,6 +87,9 @@ public:
     }
 
 private:
+    BasicIStreamWrapper(const BasicIStreamWrapper&);
+    BasicIStreamWrapper& operator=(const BasicIStreamWrapper&);
+
     StreamType& stream_;
     size_t count_;  //!< Number of characters read. Note:
     mutable Ch peekBuffer_[4];
diff --git a/include/rapidjson/ostreamwrapper.h b/include/rapidjson/ostreamwrapper.h
index 127deb3..8bf36dc 100644
--- a/include/rapidjson/ostreamwrapper.h
+++ b/include/rapidjson/ostreamwrapper.h
@@ -60,6 +60,9 @@ public:
     size_t PutEnd(char*) { RAPIDJSON_ASSERT(false); return 0; }
 
 private:
+    BasicOStreamWrapper(const BasicOStreamWrapper&);
+    BasicOStreamWrapper& operator=(const BasicOStreamWrapper&);
+
     StreamType& stream_;
 };