diff --git a/compiler/cpp/src/thriftl.ll b/compiler/cpp/src/thriftl.ll
index aee4406..5afc601 100644
--- a/compiler/cpp/src/thriftl.ll
+++ b/compiler/cpp/src/thriftl.ll
@@ -61,7 +61,11 @@
  * Must be included AFTER parse/t_program.h, but I can't remember why anymore
  * because I wrote this a while ago.
  */
+#if defined(BISON_USE_PARSER_H_EXTENSION)
 #include "thrifty.h"
+#else
+#include "thrifty.hh"
+#endif
 
 void thrift_reserved_keyword(char* keyword) {
   yyerror("Cannot use reserved language keyword: \"%s\"\n", keyword);