diff --git a/include/json/config.h b/include/json/config.h
index 0dcd8ae..5ca3228 100644
--- a/include/json/config.h
+++ b/include/json/config.h
@@ -51,6 +51,16 @@
 #define JSON_API
 #endif
 
+#if !defined(JSON_HAS_UNIQUE_PTR)
+#if __cplusplus >= 201103L
+#define JSON_HAS_UNIQUE_PTR (1)
+#elif _MSC_VER >= 1600
+#define JSON_HAS_UNIQUE_PTR (1)
+#else
+#define JSON_HAS_UNIQUE_PTR (0)
+#endif
+#endif
+
 // If JSON_NO_INT64 is defined, then Json only support C++ "int" type for
 // integer
 // Storages, and 64 bits integer support is disabled.
diff --git a/src/lib_json/json_reader.cpp b/src/lib_json/json_reader.cpp
index c133168..a2129be 100644
--- a/src/lib_json/json_reader.cpp
+++ b/src/lib_json/json_reader.cpp
@@ -43,7 +43,7 @@ static int       stackDepth_g = 0;  // see readValue()
 
 namespace Json {
 
-#if __GNUC__ >= 6
+#if JSON_HAS_UNIQUE_PTR
 typedef std::unique_ptr<CharReader> const  CharReaderPtr;
 #else
 typedef std::auto_ptr<CharReader>          CharReaderPtr;
diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index a04c66b..ec4b486 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -54,7 +54,7 @@
 
 namespace Json {
 
-#if __GNUC__ >= 6
+#if JSON_HAS_UNIQUE_PTR
 typedef std::unique_ptr<StreamWriter> const  StreamWriterPtr;
 #else
 typedef std::auto_ptr<StreamWriter>          StreamWriterPtr;