diff --git a/libavcodec/aacdec_fixed.c b/libavcodec/aacdec_fixed.c
index 392a85e46a..ddfa160adc 100644
--- a/libavcodec/aacdec_fixed.c
+++ b/libavcodec/aacdec_fixed.c
@@ -468,6 +468,7 @@ const FFCodec ff_aac_fixed_decoder = {
     .p.channel_layouts = aac_channel_layout,
 #endif
     .p.ch_layouts    = aac_ch_layout,
+    .p.priv_class    = &aac_decoder_class,
     .p.profiles      = NULL_IF_CONFIG_SMALL(ff_aac_profiles),
     .flush = flush,
 };