diff --git a/merge-pdf/merge-pdf.sh b/merge-pdf/merge-pdf.sh
index 42e8b1d..0a700d2 100755
--- a/merge-pdf/merge-pdf.sh
+++ b/merge-pdf/merge-pdf.sh
@@ -2,7 +2,7 @@
 
 while getopts ":o:" opt; do
   case $opt in
-      o | output)
+      o)
         output=$OPTARG
         ;;
       *)