--- a/converter/builtin_converters.cpp
+++ b/converter/builtin_converters.cpp
@@ -38,13 +38,18 @@ void shared_ptr_deleter::operator()(void const*)
 namespace
 {
 
-  // An lvalue conversion function which extracts a char const* from a
+   // An lvalue conversion function which extracts a char const* from a
   // Python String.
 #if PY_VERSION_HEX < 0x03000000
   void* convert_to_cstring(PyObject* obj)
   {
       return PyString_Check(obj) ? PyString_AsString(obj) : 0;
   }
+#elif PY_VERSION_HEX < 0x03070000
+  void* convert_to_cstring(PyObject* obj)
+  {
+      return PyUnicode_Check(obj) ? _PyUnicode_AsString(obj) : 0;
+  }
 #else
   void* convert_to_cstring(PyObject* obj)
   {
-- 
2.20.1.windows.1