diff --git a/src/install.sh b/src/install.sh
index 1188b35..71ea05a 100644
--- a/src/install.sh
+++ b/src/install.sh
@@ -363,8 +363,7 @@ downloadImage() {
 
   fi
 
-  for i in {1..MIRRORS}
-  do
+  for ((i=1;i<=MIRRORS;i++)); do
 
     url=$(getLink "$i" "$version")