diff --git a/JlSonic/api.jl b/JlSonic/api.jl
index 6de1ad0..2b9aa16 100644
--- a/JlSonic/api.jl
+++ b/JlSonic/api.jl
@@ -519,6 +519,7 @@ function giveconverted(file, bitrate, format)
     suffix = format
     mime = suffix in keys(Mux.mimetypes) ? Mux.mimetypes[suffix] : suffix
     headers["Content-Type"] = mime
+    wait(iodata)
     # headers["Content-Length"] = string(length(data))
     return Dict(:body => read(iodata), :headers => headers)
 end