diff --git a/include/CoolPropTools.h b/include/CoolPropTools.h
index 78de0122..40afe0ce 100644
--- a/include/CoolPropTools.h
+++ b/include/CoolPropTools.h
@@ -116,7 +116,8 @@
     }
     /// Get the size of a directory in bytes; from http://stackoverflow.com/a/17827724/1360263
     inline unsigned long long CalculateDirSize(const std::string &path){
-        return CalculateDirSize(std::wstring(path.begin(), path.end()));
+        std::wstring wpath(path.begin(), path.end());
+        return CalculateDirSize(wpath);
     }
     inline unsigned long long CalculateDirSize(const std::wstring &path, std::vector<std::wstring> *errVect = NULL, unsigned long long size = 0)
     {
diff --git a/src/CoolPropTools.cpp b/src/CoolPropTools.cpp
index d67e4d5e..f5ee8404 100644
--- a/src/CoolPropTools.cpp
+++ b/src/CoolPropTools.cpp
@@ -23,7 +23,8 @@ int ftw_function(const char *fpath, const struct stat *sb, int tflag, struct FTW
    return 0;           /* To tell nftw() to continue */
 }
 unsigned long long CalculateDirSize(const std::wstring &path){
-    return CalculateDirSize(std::string(path.begin(), path.end()))
+    std::string path(path.begin(), path.end());
+    return CalculateDirSize(path);
 }
 unsigned long long CalculateDirSize(const std::string &path){
     ftw_summer = 0;