diff --git a/doc/examples/muxing.c b/doc/examples/muxing.c
index 4550428a8e..3ab36c7a0e 100644
--- a/doc/examples/muxing.c
+++ b/doc/examples/muxing.c
@@ -547,6 +547,7 @@ static void close_stream(AVFormatContext *oc, OutputStream *ost)
     av_frame_free(&ost->frame);
     av_frame_free(&ost->tmp_frame);
     sws_freeContext(ost->sws_ctx);
+    swr_free(&ost->swr_ctx);
 }
 
 /**************************************************************/