diff --git a/louvain-master/louvain.c b/louvain-master/louvain.c
index fdbd2a139b5a0032289c1cb36c69fa443b061e51..fb73e3dddeb2579c8eb97e5f8cc03149d6117fa0 100644
--- a/louvain-master/louvain.c
+++ b/louvain-master/louvain.c
@@ -389,7 +389,7 @@ int main(int argc, char **argv)
   }
   for (i = 0; i < g->n; i++)
   {
-    fprintf(out, "%lu %lu\n", i, part[i]);
+    fprintf(out, "%lu %lu\n", i, part[i]+1);
   }
   fclose(out);
   t3 = time(NULL);