diff --git a/src/common/windows/symbol_collector_client.cc b/src/common/windows/symbol_collector_client.cc
index 6e871bf0..558a97b9 100644
--- a/src/common/windows/symbol_collector_client.cc
+++ b/src/common/windows/symbol_collector_client.cc
@@ -78,7 +78,8 @@ namespace google_breakpad {
         L"{ symbol_id: {"
         L"debug_file: \"" + debug_file + L"\", "
         L"debug_id: \"" + debug_id + L"\" "
-        L"} }";
+        L"}, "
+        L"use_async_processing: true }";
     wstring response;
     int response_code;