diff --git a/core/src/test/proto/proto_test.proto b/core/src/test/proto/proto_test.proto
index 3f4d6bc2718..8dedad6cd2b 100644
--- a/core/src/test/proto/proto_test.proto
+++ b/core/src/test/proto/proto_test.proto
@@ -33,7 +33,7 @@ message TestProtoMessage {
   /* Named ending in "builder" to check the Java builder API */
   optional TestFieldProtoMessage foo_builder = 6;
 
-  extensions 100 to 199;
+  extensions 100 to 199 [verification = UNVERIFIED];
 }
 
 message TestOneOfMessage {