diff --git a/fish/.config/fish/functions/mkvtomp4.fish b/fish/.config/fish/functions/mkvtomp4.fish
new file mode 100644
index 0000000..37ff656
--- /dev/null
+++ b/fish/.config/fish/functions/mkvtomp4.fish
@@ -0,0 +1,6 @@
+function mkvtomp4 --description "Reencode mkv to mp4"
+  for i in *.mkv
+    set fname (basename $i .mkv)
+    ffmpeg -i $i -c:v libx264 -c:a aac $fname.mp4
+  end
+end