diff --git a/httplib.h b/httplib.h
index 7576cee..521657a 100644
--- a/httplib.h
+++ b/httplib.h
@@ -1490,7 +1490,7 @@ inline std::string SocketStream::get_remote_addr() const {
 // Buffer stream implementation
 inline int BufferStream::read(char* ptr, size_t size)
 {
-#ifdef _WIN32
+#if defined(_MSC_VER) && _MSC_VER < 1900
     return static_cast<int>(buffer._Copy_s(ptr, size, size));
 #else
     return static_cast<int>(buffer.copy(ptr, size));