diff --git a/libavcodec/interplayacm.c b/libavcodec/interplayacm.c
index c897e72bb6..5639d8de82 100644
--- a/libavcodec/interplayacm.c
+++ b/libavcodec/interplayacm.c
@@ -629,5 +629,6 @@ AVCodec ff_interplay_acm_decoder = {
     .close          = decode_close,
     .decode         = decode_frame,
     .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
     .priv_data_size = sizeof(InterplayACMContext),
 };