diff --git a/ffconv-a b/ffconv-a
index 0ec9f77..13851eb 100755
--- a/ffconv-a
+++ b/ffconv-a
@@ -1,3 +1,3 @@
-#!/bin/dash
+#!/bin/sh
 # Convert audio files recursively to opus
 find ./ -type f \( -iname \*.flac -o -iname \*.mp3 -o -iname \*.ogg -o -iname \*.m4a -o -iname \*.wav \) -exec sh -c 'i="{}"; ffmpeg -y -i "$i" "${i%.*}.opus" && rm -f "$i"' \;
diff --git a/ffconv-v b/ffconv-v
index 5ee2f68..9e29614 100755
--- a/ffconv-v
+++ b/ffconv-v
@@ -1,3 +1,3 @@
-#!/bin/dash
+#!/bin/sh
 ## Convert video files to mp4 x265 codec
 find ./ -type f \( -iname \*.mkv -o -iname \*.mp4 -o -iname \*.webm -o  -iname \*.avi \) -exec sh -c 'i="{}"; ffmpeg -y -i "$i" -vf scale=1280x720 -c:v hevc -vtag hvc1 -c:a copy -crf 18 -preset ultrafast "${i%.*}-x265.mp4" && rm -f "$i"' \;
diff --git a/mac2dos b/mac2dos
index 1e3e3ae..f5a3ca0 100755
--- a/mac2dos
+++ b/mac2dos
@@ -1,2 +1,2 @@
-#!/usr/bin/env sh
+#!/bin/sh
 perl -pi -e 's/\r\n|\n|\r/\r\n/g' $1
diff --git a/mkv-cat b/mkv-cat
index b8cc8b3..7c94a91 100755
--- a/mkv-cat
+++ b/mkv-cat
@@ -1,4 +1,4 @@
-#!/bin/dash
+#!/bin/sh
 #Concatenate mkvs
 for f in ./*.mkv; do echo "file '$f'" >> list.txt; done
 && ffmpeg -f concat -safe 0 -i list.txt -c copy output.mkv