diff --git a/plugins/wasm-cpp/extensions/model_router/plugin.cc b/plugins/wasm-cpp/extensions/model_router/plugin.cc
index 6c08e79e0..5fcc18a15 100644
--- a/plugins/wasm-cpp/extensions/model_router/plugin.cc
+++ b/plugins/wasm-cpp/extensions/model_router/plugin.cc
@@ -227,6 +227,8 @@ FilterHeadersStatus PluginRootContext::onHeader(
     LOG_DEBUG(absl::StrCat("Enable multipart/form-data mode. Boundary=",
                            boundary_value));
     removeRequestHeader(Wasm::Common::Http::Header::ContentLength);
+    setFilterState(SetDecoderBufferLimitKey, DefaultMaxBodyBytes);
+    LOG_INFO(absl::StrCat("SetRequestBodyBufferLimit: ", DefaultMaxBodyBytes));
     return FilterHeadersStatus::StopIteration;
   }
   return FilterHeadersStatus::Continue;