diff --git a/libavcodec/mediacodecdec_common.c b/libavcodec/mediacodecdec_common.c
index 84c34ac270..8a270f2f29 100644
--- a/libavcodec/mediacodecdec_common.c
+++ b/libavcodec/mediacodecdec_common.c
@@ -416,6 +416,7 @@ static int mediacodec_wrap_sw_audio_buffer(AVCodecContext *avctx,
         frame->pts = info->presentationTimeUs;
     }
     frame->pkt_dts = AV_NOPTS_VALUE;
+    frame->flags |= AV_FRAME_FLAG_KEY;
 
     av_log(avctx, AV_LOG_TRACE,
            "Frame: format=%d channels=%d sample_rate=%d nb_samples=%d",