diff --git a/script-install-banner b/script-install-banner
index 278f0f91..57b99b5d 100644
--- a/script-install-banner
+++ b/script-install-banner
@@ -20,7 +20,7 @@ else
 fi
 
 cat <<- 'EOF' > "$banner"
-#!/usr/bin/env bash5
+#!/usr/bin/env bash
 
 echo -n '
  _    _            _                           _           _     
@@ -73,7 +73,7 @@ dim="\e[2m"
 undim="\e[0m"
 
 # disk usage: ignore zfs, squashfs & tmpfs
-mapfile -t dfs < <(df -H -x zfs -x squashfs -x tmpfs -x devtmpfs -x overlay --output=target,pcent,size | tail -n+2)
+while IFS= read -r line; do dfs+=("$line"); done < <(df -H -x zfs -x squashfs -x tmpfs -x devtmpfs -x overlay --output=target,pcent,size | tail -n+2)
 printf "\ndisk usage:\n"
 
 for line in "${dfs[@]}"; do