diff --git a/third_party/upb/upb/msg.c b/third_party/upb/upb/msg.c
index a77da5665c..399e8753ba 100644
--- a/third_party/upb/upb/msg.c
+++ b/third_party/upb/upb/msg.c
@@ -33,17 +33,26 @@ static size_t upb_msg_sizeof(const upb_msglayout *l) {
 }
 
 static upb_msg_internal *upb_msg_getinternal(upb_msg *msg) {
+#pragma warning(push)
+#pragma warning(disable : 4146)
   return VOIDPTR_AT(msg, -sizeof(upb_msg_internal));
+#pragma warning(pop)
 }
 
 static const upb_msg_internal *upb_msg_getinternal_const(const upb_msg *msg) {
+#pragma warning(push)
+#pragma warning(disable : 4146)
   return VOIDPTR_AT(msg, -sizeof(upb_msg_internal));
+#pragma warning(pop)
 }
 
 static upb_msg_internal_withext *upb_msg_getinternalwithext(
     upb_msg *msg, const upb_msglayout *l) {
   UPB_ASSERT(l->extendable);
+#pragma warning(push)
+#pragma warning(disable : 4146)
   return VOIDPTR_AT(msg, -sizeof(upb_msg_internal_withext));
+#pragma warning(pop)
 }
 
 upb_msg *upb_msg_new(const upb_msglayout *l, upb_arena *a) {