diff --git a/fetch_fio_fine.sh b/fetch_fio_fine.sh
index ab91e81..2bc623b 100644
--- a/fetch_fio_fine.sh
+++ b/fetch_fio_fine.sh
@@ -370,7 +370,7 @@ while read accnt ; do
 	    currentmonth=12
 	    currentyear=`expr $currentyear - 1`
 	else
-	    currentmonth=`$currentmonth - 1`
+	    currentmonth=`expr $currentmonth - 1`
 	fi
     done