diff --git a/dev/src/index.ts b/dev/src/index.ts
index 8d470c29e..4bf0d2131 100644
--- a/dev/src/index.ts
+++ b/dev/src/index.ts
@@ -631,6 +631,7 @@ export class Firestore implements firestore.Firestore {
             {
               ...this._settings,
               fallback: useFallback,
+              minifyJson: true,
             },
             gax
           );