diff --git a/setup/so-common-functions b/setup/so-common-functions
index 682e53fa7..824e51f21 100644
--- a/setup/so-common-functions
+++ b/setup/so-common-functions
@@ -58,10 +58,10 @@ set_defaul_log_size() {
 	local disk_size_1k
 	disk_size_1k=$(df $disk_dir | grep -v "^Filesystem" | awk '{print $2}')
 
-    local ratio="4.7683715820313e-7"
+    local ratio="1048576"
 
     local disk_size_gb
-    disk_size_gb=$( echo "$disk_size_1k" "$ratio" | awk '{print($1*$2)}' )
+    disk_size_gb=$( echo "$disk_size_1k" "$ratio" | awk '{print($1/$2)}' )
 
 	log_size_limit=$( echo "$disk_size_gb" "$percentage" | awk '{printf("%.0f", $1 * ($2/100))}')
 	export log_size_limit