diff --git a/w2v-server.pl b/w2v-server.pl
index 9c02dc4..5792893 100755
--- a/w2v-server.pl
+++ b/w2v-server.pl
@@ -655,7 +655,7 @@
   int syn_threads = (M2? window * 2 : 0);
   int para_threads = num_threads - syn_threads;
 
-  collocator *best = malloc(MAX_NEIGHBOURS * sizeof(collocator));
+  collocator *best = malloc(10*MAX_NEIGHBOURS * sizeof(collocator));
 
   if(N>MAX_NEIGHBOURS) N=MAX_NEIGHBOURS;