diff --git src/CSFunctionParser.cpp src/CSFunctionParser.cpp
index edfcf44..7f3eb9a 100644
--- src/CSFunctionParser.cpp
+++ src/CSFunctionParser.cpp
@@ -18,6 +18,7 @@
 #include "CSFunctionParser.h"
 #include <math.h>
 #include <iostream>
+#include <clocale>
 
 double bessel_first_kind_0(const double* p)
 {
diff --git src/ParameterObjects.cpp src/ParameterObjects.cpp
index ada5007..fd112c3 100644
--- src/ParameterObjects.cpp
+++ src/ParameterObjects.cpp
@@ -21,6 +21,7 @@
 #include "tinyxml.h"
 #include "CSFunctionParser.h"
 #include "CSUseful.h"
+#include <clocale>
 
 bool ReadTerm(ParameterScalar &PS, TiXmlElement &elem, const char* attr, double val)
 {