diff --git a/langtools/.hgtags b/langtools/.hgtags
index 894b3998f36..922d86d25ce 100644
--- a/langtools/.hgtags
+++ b/langtools/.hgtags
@@ -420,3 +420,4 @@ aae59039c1f5701ae933c5eed30e75d6e3afaeee jdk-9+171
 83f6eb009d8f6e94fd348c7d23e4b00754d745db jdk-9+175
 0d0ac75b0f6cbe218362e3fac4bb443496e7258f jdk-9+176
 2f01728210c1405ef459e69d9c7247b5df6abb78 jdk-9+177
+849e366ef175012e6dedc3ca151da416716e0ea9 jdk-9+178