diff --git a/zangramru/services/puzzles.py b/zangramru/services/puzzles.py
index 23b270b..01fc1fd 100644
--- a/zangramru/services/puzzles.py
+++ b/zangramru/services/puzzles.py
@@ -239,6 +239,7 @@ class PuzzleGenerator:
             prev = path[0]
             for tile in path[1:]:
                 neigbours[prev].add(tile)
+                neigbours[tile].add(prev)
                 prev = tile
 
         extras = {w: p for w, p in solutions.items() if w not in cover}