diff --git a/pkg/model/resources/nodeup.go b/pkg/model/resources/nodeup.go
index db98de43af..372f03f1fa 100644
--- a/pkg/model/resources/nodeup.go
+++ b/pkg/model/resources/nodeup.go
@@ -74,7 +74,7 @@ download-or-bust() {
   local -r file="$1"
   local -r hash="$2"
   local -a urls
-  mapfile -t urls < <(split-commas "$3")
+  IFS=, read -r -a urls <<< "$3"
 
   if [[ -f "${file}" ]]; then
     if ! validate-hash "${file}" "${hash}"; then
@@ -125,10 +125,6 @@ validate-hash() {
   fi
 }
 
-function split-commas() {
-  echo "$1" | tr "," "\n"
-}
-
 function download-release() {
   case "$(uname -m)" in
   x86_64*|i?86_64*|amd64*)