diff --git a/internal/class.h b/internal/class.h
index f163b7445c..63fe84c6ab 100644
--- a/internal/class.h
+++ b/internal/class.h
@@ -26,12 +26,6 @@ struct rb_subclass_entry {
     struct rb_subclass_entry *prev;
 };
 
-struct rb_iv_index_tbl_entry {
-    uint32_t index;
-    shape_id_t source_shape_id;
-    shape_id_t dest_shape_id;
-};
-
 struct rb_cvar_class_tbl_entry {
     uint32_t index;
     rb_serial_t global_cvar_state;
diff --git a/mjit_c.rb b/mjit_c.rb
index 30a9f17a2c..7684755b6b 100644
--- a/mjit_c.rb
+++ b/mjit_c.rb
@@ -527,15 +527,6 @@ module RubyVM::MJIT
     @rb_iseq_t ||= self.rb_iseq_struct
   end
 
-  def C.rb_iv_index_tbl_entry
-    @rb_iv_index_tbl_entry ||= CType::Struct.new(
-      "rb_iv_index_tbl_entry", Primitive.cexpr!("SIZEOF(struct rb_iv_index_tbl_entry)"),
-      index: [CType::Immediate.parse("uint32_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_iv_index_tbl_entry *)NULL)), index)")],
-      source_shape_id: [self.shape_id_t, Primitive.cexpr!("OFFSETOF((*((struct rb_iv_index_tbl_entry *)NULL)), source_shape_id)")],
-      dest_shape_id: [self.shape_id_t, Primitive.cexpr!("OFFSETOF((*((struct rb_iv_index_tbl_entry *)NULL)), dest_shape_id)")],
-    )
-  end
-
   def C.rb_method_definition_struct
     @rb_method_definition_struct ||= CType::Struct.new(
       "rb_method_definition_struct", Primitive.cexpr!("SIZEOF(struct rb_method_definition_struct)"),
diff --git a/tool/mjit/bindgen.rb b/tool/mjit/bindgen.rb
index 77b81814e3..4d79b32bc2 100755
--- a/tool/mjit/bindgen.rb
+++ b/tool/mjit/bindgen.rb
@@ -373,7 +373,6 @@ generator = BindingGenerator.new(
     rb_iseq_location_t
     rb_iseq_struct
     rb_iseq_t
-    rb_iv_index_tbl_entry
     rb_method_definition_struct
     rb_method_iseq_t
     rb_method_type_t