Converting files to OGG with FFMPEG produces an extremely large file

When trying to convert either an mp3 or flac file to ogg, the output ogg file is actually a flac file with a large file size. For instance: running for file in *.mp3; do ffmpeg -i "${file}" "${file/%mp3/ogg}"; done and then checking the file with mediainfo output.ogg gives: General Complete name : 06 - Magma.ogg Format : Ogg Format/Info : Free Lossless Audio Codec File size : 47.0 MiB Duration : 6mn 42s Overall bit rate mode : Variable Overall bit rate : 980 Kbps Audio ID : 1238237382 (0x49CE00C6) Format : FLAC Format/Info : Free Lossless Audio Codec Duration : 6mn 42s Bit rate mode : Variable Channel(s) : 2 channels Channel positions : Front: L R Sampling rate : 44.1 KHz Bit depth : 16 bits Writing library : Lavf57.37.100 The input mp3 in my case was 6 megabytes, but the ogg file is for some reason 47 megabytes. Why is this happening, and is there a why to convert files to ogg without this happening?