diff --git a/lib/dns/.gitignore b/lib/dns/.gitignore
index 8644f52ffc..d6a4772a27 100644
--- a/lib/dns/.gitignore
+++ b/lib/dns/.gitignore
@@ -4,3 +4,4 @@ gen
 enumclass.h
 enumtype.h
 rdatastruct.h
+gen.dSYM