diff --git a/xCAT-server/share/xcat/install/scripts/getinstdisk b/xCAT-server/share/xcat/install/scripts/getinstdisk
index 14c232748..48f07d97a 100644
--- a/xCAT-server/share/xcat/install/scripts/getinstdisk
+++ b/xCAT-server/share/xcat/install/scripts/getinstdisk
@@ -44,7 +44,7 @@ if [ -z "$install_disk" ]; then
 
     # Classify entries by DEVTYPE
     for entry in $entries; do
-        DEVSIZE=$(udevadm info --attribute-walk --name=$entry|grep size| sed -e 's/[^"]*"//' -e 's/"//'|tail -n 1)
+        DEVSIZE=$(udevadm info --attribute-walk --name=$entry|grep {size}| sed -e 's/[^"]*"//' -e 's/"//'|tail -n 1)
         if [ -z "$DEVSIZE" -o $DEVSIZE -lt 262144 ]; then
             # ignore small devices, that are likely remote media or similar
             continue