diff --git a/zip-seperate b/zip-seperate
index c1a9461..129bd2e 100755
--- a/zip-seperate
+++ b/zip-seperate
@@ -1,6 +1,9 @@
 #!/usr/bin/env bash
+shopt -s nullglob
 
-for filename in *.iso; do
+file_ext="${1:-.iso}"
+
+for filename in *"$file_ext"; do
 	echo "Zipping file: $filename"
 	gzip "$filename"
 done