diff --git a/arch/ppc64/boot/install.sh b/arch/ppc64/boot/install.sh
index cb2d6626b555..eacce9590816 100644
--- a/arch/ppc64/boot/install.sh
+++ b/arch/ppc64/boot/install.sh
@@ -28,7 +28,7 @@ if [ -x /sbin/${CROSS_COMPILE}installkernel ]; then exec /sbin/${CROSS_COMPILE}i
 # Default install
 
 # this should work for both the pSeries zImage and the iSeries vmlinux.sm
-image_name=`basename $5`
+image_name=`basename $2`
 
 if [ -f $4/$image_name ]; then
 	mv $4/$image_name $4/$image_name.old