diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index 8e408c808a..27f68933f8 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -567,6 +567,7 @@ static void ffmpeg_cleanup(int ret)
         ost->audio_channels_mapped = 0;
 
         av_dict_free(&ost->sws_dict);
+        av_dict_free(&ost->swr_opts);
 
         avcodec_free_context(&ost->enc_ctx);
         avcodec_parameters_free(&ost->ref_par);