diff --git a/src/test.cpp b/src/test.cpp
index 54d9e9d..86157ef 100644
--- a/src/test.cpp
+++ b/src/test.cpp
@@ -866,7 +866,7 @@ Callbacks printCallbacks() {
 struct MinifyState {
   bool isKey = false;
   struct Cursor {
-    int index;
+    int64_t index;
     bool isObject;
   };
   void on_begin_value() {