diff --git a/.gitignore b/.gitignore
index 74c5aaf0e8..48d2fd1835 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,6 +36,7 @@
 /src/supplement.gypi
 /testFiles
 /testing
+/third_party/cygwin
 /third_party/expat
 /third_party/google-gflags/src
 /third_party/jsoncpp