diff --git a/xCAT/postscripts/ospkgs b/xCAT/postscripts/ospkgs
index 666ae1e97..0dcb48d01 100755
--- a/xCAT/postscripts/ospkgs
+++ b/xCAT/postscripts/ospkgs
@@ -235,7 +235,7 @@ else
 
     if [ "$KERNELDIR" != "" ]; then 
         if [ $mounted -eq 0 ]; then
-            OSPKGDIR="$OSPKGDIR:$KERNELDIR"
+            OSPKGDIR="$OSPKGDIR,$KERNELDIR"
         fi
     fi