diff --git a/iseq.h b/iseq.h
index bae534c71d..6a6c69a114 100644
--- a/iseq.h
+++ b/iseq.h
@@ -289,7 +289,6 @@ enum defined_type {
     DEFINED_FALSE,
     DEFINED_ASGN,
     DEFINED_EXPR,
-    DEFINED_IVAR2,
     DEFINED_REF,
     DEFINED_FUNC,
     DEFINED_CONST_FROM
diff --git a/tool/ruby_vm/views/_leaf_helpers.erb b/tool/ruby_vm/views/_leaf_helpers.erb
index cbb7373e1c..1735db2196 100644
--- a/tool/ruby_vm/views/_leaf_helpers.erb
+++ b/tool/ruby_vm/views/_leaf_helpers.erb
@@ -20,7 +20,6 @@ leafness_of_defined(rb_num_t op_type)
     /* see also: vm_insnhelper.c:vm_defined() */
     switch (op_type) {
       case DEFINED_IVAR:
-      case DEFINED_IVAR2:
       case DEFINED_GVAR:
       case DEFINED_CVAR:
       case DEFINED_YIELD:
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 4d9e7802eb..5f8bffb380 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -3998,9 +3998,6 @@ vm_defined(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp, rb_num_t op_
 	    expr_type = DEFINED_IVAR;
 	}
 	break;
-      case DEFINED_IVAR2:
-	klass = vm_get_cbase(GET_EP());
-	break;
       case DEFINED_GVAR:
 	if (rb_gvar_defined(SYM2ID(obj))) {
 	    expr_type = DEFINED_GVAR;