diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 5b3fd9e..099f6df 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -646,7 +646,7 @@
 				"unknown encoding: %s", tok->enc);
 			return error_ret(tok);
 		}
-		str = PyBytes_AsString(utf8);
+		str = PyString_AS_STRING(utf8);
 	}
 	assert(tok->decoding_buffer == NULL);
 	tok->decoding_buffer = utf8; /* CAUTION */
@@ -765,8 +765,8 @@
 					tok->done = E_DECODE;
 					return EOF;
 				}
-				buflen = PyBytes_Size(u);
-				buf = PyBytes_AsString(u);
+				buflen = PyString_GET_SIZE(u);
+				buf = PyString_AS_STRING(u);
 				if (!buf) {
 					Py_DECREF(u);
 					tok->done = E_DECODE;
@@ -1550,7 +1550,7 @@
 #else
 static PyObject *
 dec_utf8(const char *enc, const char *text, size_t len) {
-	PyObject *ret = NULL;	
+	PyObject *ret = NULL;
 	PyObject *unicode_text = PyUnicode_DecodeUTF8(text, len, "replace");
 	if (unicode_text) {
 		ret = PyUnicode_AsEncodedString(unicode_text, enc, "replace");
@@ -1560,7 +1560,7 @@
 		PyErr_Clear();
 	}
         else {
-		assert(PyBytes_Check(ret));
+		assert(PyString_Check(ret));
 	}
 	return ret;
 }
@@ -1573,8 +1573,8 @@
 		/* convert source to original encondig */
 		PyObject *lineobj = dec_utf8(tok->encoding, tok->buf, len);
 		if (lineobj != NULL) {
-			int linelen = PyBytes_GET_SIZE(lineobj);
-			const char *line = PyBytes_AS_STRING(lineobj);
+			int linelen = PyString_GET_SIZE(lineobj);
+			const char *line = PyString_AS_STRING(lineobj);
 			text = PyObject_MALLOC(linelen + 1);
 			if (text != NULL && line != NULL) {
 				if (linelen)
@@ -1582,19 +1582,18 @@
 				text[linelen] = '\0';
 			}
 			Py_DECREF(lineobj);
-					
+
 			/* adjust error offset */
 			if (*offset > 1) {
-				PyObject *offsetobj = dec_utf8(tok->encoding, 
+				PyObject *offsetobj = dec_utf8(tok->encoding,
 							       tok->buf,
 							       *offset-1);
 				if (offsetobj) {
-					*offset = 1 +
-						PyBytes_GET_SIZE(offsetobj);
+					*offset = 1 + Py_Size(offsetobj);
 					Py_DECREF(offsetobj);
 				}
 			}
-			
+
 		}
 	}
 	return text;