Index: src/string.cpp
===================================================================
--- src/string.cpp
+++ src/string.cpp
@@ -90,7 +90,7 @@
 as_integer(const string& func, const string& s, size_t* idx, int base )
 {
     // Use long as no Standard string to integer exists.
-    long r = as_integer_helper<long>( func, s, idx, base, strtol );
+    long long r = as_integer_helper<long long>( func, s, idx, base, strtol );
     if (r < numeric_limits<int>::min() || numeric_limits<int>::max() < r)
         throw_from_string_out_of_range(func);
     return static_cast<int>(r);
@@ -135,7 +135,7 @@
 as_integer( const string& func, const wstring& s, size_t* idx, int base )
 {
     // Use long as no Stantard string to integer exists.
-    long r = as_integer_helper<long>( func, s, idx, base, wcstol );
+    long long r = as_integer_helper<long long>( func, s, idx, base, wcstol );
     if (r < numeric_limits<int>::min() || numeric_limits<int>::max() < r)
         throw_from_string_out_of_range(func);
     return static_cast<int>(r);