diff --git a/dotpiwall.py b/dotpiwall.py
index 923e37e..c247cb9 100644
--- a/dotpiwall.py
+++ b/dotpiwall.py
@@ -45,7 +45,7 @@ def wall_definition(self):
     def tile_definition(self, tile):
         s = []
         s.append('[%s_%s]' % (self.name, tile.id))
-        s.append('wall=%s' % self.name)
+        s.append('wall=%s_wall' % self.name)
         s.append('width=%d' % tile.W())
         s.append('height=%d' % tile.H())
         s.append('x=%d' % tile.wx)