diff --git a/src/vmbl.h b/src/vmbl.h
index 333e57e..aee8703 100644
--- a/src/vmbl.h
+++ b/src/vmbl.h
@@ -7,8 +7,8 @@
 #include <stdbool.h>
 #include "exception.h"
 
-#define VMBL_STACK_SIZE 0x5E
-#define VMBL_PROGRAM_SIZE 512
+#define VMBL_STACK_SIZE 1024
+#define VMBL_PROGRAM_SIZE 1024
 
 typedef int64_t Word;