fix code style.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/map.h b/src/map.h
index 2c5e0ff9c..a449bbc6b 100644
--- a/src/map.h
+++ b/src/map.h
@@ -411,8 +411,8 @@ class Map final : public Properties, public ConfigListener
         WalkLayer *getWalkLayer()
         { return mWalkLayer; }
 
-        void setWalkLayer(WalkLayer *l)
-        { mWalkLayer = l; }
+        void setWalkLayer(WalkLayer *const layer)
+        { mWalkLayer = layer; }
 
     protected:
         friend class Actor;