diff --git a/tools/xen/install_os_domU.sh b/tools/xen/install_os_domU.sh
index 082c27e8f3..b49347e09b 100755
--- a/tools/xen/install_os_domU.sh
+++ b/tools/xen/install_os_domU.sh
@@ -227,7 +227,7 @@ if [ -z "$templateuuid" ]; then
         -n "$UBUNTU_INST_BRIDGE_OR_NET_NAME" \
         -l "$GUEST_NAME"
 
-    set_vm_memory "$GUEST_NAME" "$OSDOMU_MEM_MB"
+    set_vm_memory "$GUEST_NAME" "1024"
 
     xe vm-start vm="$GUEST_NAME"