1 files changed, 2 insertions, 0 deletions
diff --git a/vm_core.h b/vm_core.h
index 9d776c952d..d890c1619b 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -349,6 +349,8 @@ typedef struct rb_vm_struct {
      * objects so do *NOT* mark this when you GC.
      */
     struct RArray at_exit;
+
+    VALUE *defined_strings;
 } rb_vm_t;
 
 typedef struct {