diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2ecc32400..3093c4e80 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.0)
 project(Gradido_LoginServer C CXX)
 SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY "bin" )
 
-add_definitions("-std=c++11")
+SET ( CMAKE_CXX_FLAGS "-std=c++17" )
 
 include_directories(
 	"dependencies" 
diff --git a/src/cpp/lib/DataTypeConverter.cpp b/src/cpp/lib/DataTypeConverter.cpp
index e8f6cde00..72db0ec58 100644
--- a/src/cpp/lib/DataTypeConverter.cpp
+++ b/src/cpp/lib/DataTypeConverter.cpp
@@ -3,6 +3,9 @@
 #include <stdexcept>
 #include "sodium.h"
 
+// needed for memset in linux
+#include <string.h>
+
 namespace DataTypeConverter
 {
 	NumberParseState strToInt(const std::string& input, int& result)
diff --git a/src/cpp/lib/DataTypeConverter.h b/src/cpp/lib/DataTypeConverter.h
index 7777d4b29..5ca654802 100644
--- a/src/cpp/lib/DataTypeConverter.h
+++ b/src/cpp/lib/DataTypeConverter.h
@@ -4,6 +4,7 @@
 #include <string>
 #include "../SingletonManager/MemoryManager.h"
 
+
 namespace DataTypeConverter {
 
 	enum NumberParseState