diff --git a/core/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java b/core/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
index fca48c9ee3a..047afdc9503 100644
--- a/core/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
+++ b/core/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
@@ -2192,7 +2192,9 @@ public abstract class CitrixResourceBase implements StoragePoolResource, ServerR
         if (!(guestOsTypeName.startsWith("Windows") || guestOsTypeName.startsWith("Citrix") || guestOsTypeName.startsWith("Other"))) {
             if (cmd.getBootFromISO()) {
                 vm.setPVBootloader(conn, "eliloader");
-                vm.addToOtherConfig(conn, "install-repository", "cdrom");
+                Map<String, String> otherConfig = vm.getOtherConfig(conn);
+                otherConfig.put( "install-repository", "cdrom");
+                vm.setOtherConfig(conn, otherConfig);
             } else {
                 vm.setPVBootloader(conn, "pygrub");
             }