1 files changed, 2 insertions, 0 deletions
diff --git a/upb/def.c b/upb/def.c
index 4a893d1..5b239dd 100644
--- a/upb/def.c
+++ b/upb/def.c
@@ -311,6 +311,8 @@ static void assign_msg_wellknowntype(upb_msgdef *m) {
   }
   if (!strcmp(name, "google.protobuf.Any")) {
     m->well_known_type = UPB_WELLKNOWN_ANY;
+  } else if (!strcmp(name, "google.protobuf.FieldMask")) {
+    m->well_known_type = UPB_WELLKNOWN_FIELDMASK;
   } else if (!strcmp(name, "google.protobuf.Duration")) {
     m->well_known_type = UPB_WELLKNOWN_DURATION;
   } else if (!strcmp(name, "google.protobuf.Timestamp")) {