diff -ruN a/src/cbang/js/v8/V8.h b/src/cbang/js/v8/V8.h
--- a/src/cbang/js/v8/V8.h	2023-04-12 13:01:26.846888687 -0400
+++ b/src/cbang/js/v8/V8.h	2023-04-12 13:02:23.030223080 -0400
@@ -41,5 +41,6 @@
 #define V8STDINT_H_
 
 #define V8_ENABLE_CHECKS
+#define V8_ENABLE_SANDBOX
 
 #include <v8.h>