diff --git a/bin/xt-create-xen-config b/bin/xt-create-xen-config
index 6c762a1..f94823f 100755
--- a/bin/xt-create-xen-config
+++ b/bin/xt-create-xen-config
@@ -305,6 +305,7 @@ sub importPartitionsFromEnvironment
 {
     @PARTITIONS = ();
 
+    return unless exists $ENV{'NUMPARTITIONS'};
     for ( my $i = 1 ; $i <= $ENV{ 'NUMPARTITIONS' } ; $i++ )
     {
         my @parts = split( /:/, $ENV{ 'PARTITION' . $i }, 7 );