diff --git a/Lib/python/pyhead.swg b/Lib/python/pyhead.swg
index 9a55d76cf..b3bd39dfc 100644
--- a/Lib/python/pyhead.swg
+++ b/Lib/python/pyhead.swg
@@ -37,7 +37,9 @@
 SWIGINTERN char*
 SWIG_Python_str_AsChar(PyObject *str)
 {
-#if PY_VERSION_HEX >= 0x03000000
+#if PY_VERSION_HEX >= 0x03030000
+  return (char *)PyUnicode_AsUTF8(str);
+#elif PY_VERSION_HEX >= 0x03000000
   char *newstr = 0;
   str = PyUnicode_AsUTF8String(str);
   if (str) {
@@ -56,10 +58,10 @@ SWIG_Python_str_AsChar(PyObject *str)
 #endif
 }
 
-#if PY_VERSION_HEX >= 0x03000000
-#  define SWIG_Python_str_DelForPy3(x) free( (void*) (x) )
+#if PY_VERSION_HEX >= 0x03030000 || PY_VERSION_HEX < 0x03000000
+#  define SWIG_Python_str_DelForPy3(x)
 #else
-#  define SWIG_Python_str_DelForPy3(x) 
+#  define SWIG_Python_str_DelForPy3(x) free( (void*) (x) )
 #endif