diff --git a/packages/proto-loader/src/index.ts b/packages/proto-loader/src/index.ts
index 98ca97b51..75194b7a0 100644
--- a/packages/proto-loader/src/index.ts
+++ b/packages/proto-loader/src/index.ts
@@ -148,7 +148,7 @@ const descriptorOptions: Protobuf.IConversionOptions = {
   longs: String,
   enums: String,
   bytes: String,
-  defaults: true,
+  defaults: false,
   oneofs: true,
   json: true,
 };