diff --git a/w2v-server.pl b/w2v-server.pl
index 8bf0f14..2f402ec 100755
--- a/w2v-server.pl
+++ b/w2v-server.pl
@@ -140,12 +140,14 @@
     my $d1 = decode_json($cccache{$word});
     my $d2 = decode_json($s2);
     my %d2ld;
+    my $minLd = 14;
     foreach my $i (@{$d2->{collocates}}) {
       $d2ld{$i->{word}}=$i->{ld};
+      $minLd=$i->{ld} if($i->{ld} < $minLd);
     }
     foreach my $i (@{$d1->{collocates}}) {
       my $w = $i->{word};
-      $i->{delta} = $i->{ld} - (defined $d2ld{$w} ? $d2ld{$w} : 0);
+      $i->{delta} = $i->{ld} - (defined $d2ld{$w} ? $d2ld{$w} : $minLd-0.1);
     }
     return(encode_json($d1));
   } else {