diff --git a/.gitignore b/.gitignore
index 70e05f0..3421aef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,6 +55,7 @@
 /compiler/cpp/thrift
 /compiler/cpp/thriftl.cc
 /compiler/cpp/thrifty.cc
+/compiler/cpp/lex.yythriftl.cc
 /compiler/cpp/thrifty.h
 /compiler/cpp/thrifty.hh
 /compiler/cpp/version.h