diff --git a/scripts/common.sh.in b/scripts/common.sh.in
index 8e1d30d4a5..18ae194036 100644
--- a/scripts/common.sh.in
+++ b/scripts/common.sh.in
@@ -410,3 +410,14 @@ join() {
         printf "$sep%s" "${elements[@]:1}"
     fi
 }
+
+# helper function to check for element in array
+contains() {
+    local -r match=$1; shift
+
+    for element; do
+        [[ "$element" == "$match" ]] && return
+    done
+
+    return 1
+}
diff --git a/scripts/iso-manager.sh b/scripts/iso-manager.sh
index b4d1a88e19..260a708438 100755
--- a/scripts/iso-manager.sh
+++ b/scripts/iso-manager.sh
@@ -79,16 +79,6 @@ _set_env() {
     fi
 }
 
-# helper function to check for element in array
-containsElement () {
-  local element match="$1"
-  shift
-  for element in "$@"; do
-      [[ "$element" == "$match" ]] && return 0;
-  done
-  return 1
-}
-
 _add_archives() {
     # Skip adding archive if None passed
     [ $# -lt 1 ] && return 0
@@ -101,7 +91,7 @@ _add_archives() {
         archives <<< "$(salt-call pillar.get metalk8s:archives \
         --out txt | cut -d' ' -f2- | tr -d '[],')"
     for archive in "$@"; do
-        if ! containsElement "'$archive'" "${archives[@]}"; then
+        if ! contains "$archive" "${archives[@]}"; then
             archives+=("'$archive'")
         fi
     done