diff --git a/src/lib_json/json_reader.cpp b/src/lib_json/json_reader.cpp
index 290e0b1..c133168 100644
--- a/src/lib_json/json_reader.cpp
+++ b/src/lib_json/json_reader.cpp
@@ -44,7 +44,7 @@ static int       stackDepth_g = 0;  // see readValue()
 namespace Json {
 
 #if __GNUC__ >= 6
-typedef std::scoped_ptr<CharReader> const  CharReaderPtr;
+typedef std::unique_ptr<CharReader> const  CharReaderPtr;
 #else
 typedef std::auto_ptr<CharReader>          CharReaderPtr;
 #endif
diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index f2eb200..a04c66b 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -55,7 +55,7 @@
 namespace Json {
 
 #if __GNUC__ >= 6
-typedef std::scoped_ptr<StreamWriter> const  StreamWriterPtr;
+typedef std::unique_ptr<StreamWriter> const  StreamWriterPtr;
 #else
 typedef std::auto_ptr<StreamWriter>          StreamWriterPtr;
 #endif