diff --git a/hw/audio/hda-codec.c b/hw/audio/hda-codec.c
index cbd92b72f2..2d16448181 100644
--- a/hw/audio/hda-codec.c
+++ b/hw/audio/hda-codec.c
@@ -898,6 +898,7 @@ static void hda_audio_base_class_init(ObjectClass *klass, void *data)
 static const TypeInfo hda_audio_info = {
     .name          = TYPE_HDA_AUDIO,
     .parent        = TYPE_HDA_CODEC_DEVICE,
+    .instance_size = sizeof(HDAAudioState),
     .class_init    = hda_audio_base_class_init,
     .abstract      = true,
 };
@@ -914,7 +915,6 @@ static void hda_audio_output_class_init(ObjectClass *klass, void *data)
 static const TypeInfo hda_audio_output_info = {
     .name          = "hda-output",
     .parent        = TYPE_HDA_AUDIO,
-    .instance_size = sizeof(HDAAudioState),
     .class_init    = hda_audio_output_class_init,
 };
 
@@ -930,7 +930,6 @@ static void hda_audio_duplex_class_init(ObjectClass *klass, void *data)
 static const TypeInfo hda_audio_duplex_info = {
     .name          = "hda-duplex",
     .parent        = TYPE_HDA_AUDIO,
-    .instance_size = sizeof(HDAAudioState),
     .class_init    = hda_audio_duplex_class_init,
 };
 
@@ -946,7 +945,6 @@ static void hda_audio_micro_class_init(ObjectClass *klass, void *data)
 static const TypeInfo hda_audio_micro_info = {
     .name          = "hda-micro",
     .parent        = TYPE_HDA_AUDIO,
-    .instance_size = sizeof(HDAAudioState),
     .class_init    = hda_audio_micro_class_init,
 };