diff --git a/create_retroarch_thumbnails.sh b/create_retroarch_thumbnails.sh
index dc4dfcd..cd0bbdb 100755
--- a/create_retroarch_thumbnails.sh
+++ b/create_retroarch_thumbnails.sh
@@ -21,7 +21,7 @@ if [ "$#" -ne 3 ]; then
 fi
 
 # check if the system parameter is valid
-if ! echo "$SYSTEMS" | grep -w "$2" >/dev/null; then
+if ! echo "$SYSTEMS" | grep -w "$1" >/dev/null; then
     printf "%s\n" "You must enter a valid system name."
     help_message
     exit 0