1 files changed, 1 insertions, 0 deletions
diff --git a/vm_core.h b/vm_core.h
index d021a91daa..9f6f638c4d 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -165,6 +165,7 @@ typedef struct rb_call_info_struct {
     union {
 	int opt_pc; /* used by iseq */
 	long index; /* used by ivar */
+	int missing_reason; /* used by method_missing */
     } aux;
 
     VALUE (*call)(struct rb_thread_struct *th, struct rb_control_frame_struct *cfp, struct rb_call_info_struct *ci);