Index: Parser/tokenizer.c
===================================================================
--- Parser/tokenizer.c	(revision 58192)
+++ Parser/tokenizer.c	(working copy)
@@ -395,6 +395,7 @@
 			goto error;
 		buflen = size;
 	}
+
 	memcpy(s, buf, buflen);
 	s[buflen] = '\0';
 	if (buflen == 0) /* EOF */
@@ -402,6 +403,12 @@
 	if (allocated) {
 		Py_DECREF(bufobj);
 	}
+
+  if ( bufobj == tok->decoding_buffer ){
+    Py_XDECREF(tok->decoding_buffer);
+    tok->decoding_buffer = 0;
+  }
+
 	return s;
 
 error: