diff --git a/data/terrain-graphics.cfg b/data/terrain-graphics.cfg
index d838c4c0772..9dcbbf2afc6 100644
--- a/data/terrain-graphics.cfg
+++ b/data/terrain-graphics.cfg
@@ -88,7 +88,7 @@
 
 {FORESTADJCASTLES f Cn 100 forest-castle}
 {FORESTADJCASTLES F Cn 100 snow-forest-castle}
-{FORESTADJCASTLES ] ol 100 mushrooms-castle}
+{FORESTADJCASTLES ] olW 100 mushrooms-castle}
 
 #define FORESTADJCASTLEO FID ID PROB TILE
 [terrain_graphics]
@@ -126,7 +126,7 @@
 
 {FORESTADJCASTLEO f Cn 100 forest-castle}
 {FORESTADJCASTLEO F Cn 100 snow-forest-castle}
-{FORESTADJCASTLEO ] ol 100 mushrooms-castle}
+{FORESTADJCASTLEO ] olW 100 mushrooms-castle}
 
 #define FORESTADJCASTLE FID ID PROB TILE
 [terrain_graphics]
@@ -164,7 +164,7 @@
 
 {FORESTADJCASTLE f Cn 100 forest-castle}
 {FORESTADJCASTLE F Cn 100 snow-forest-castle}
-{FORESTADJCASTLE ] ol 100 mushrooms-castle}
+{FORESTADJCASTLE ] olW 100 mushrooms-castle}
 
 #-----------------------------------------------------------------
 # Use a smaller tile when next to:
diff --git a/images/terrain/mushrooms-castle-ne.png b/images/terrain/mushrooms-castle-ne.png
index dee2b3a3b08..4d0c3bc8a14 100644
Binary files a/images/terrain/mushrooms-castle-ne.png and b/images/terrain/mushrooms-castle-ne.png differ
diff --git a/images/terrain/mushrooms.png b/images/terrain/mushrooms.png
index 54707bfd381..5176bd48d11 100644
Binary files a/images/terrain/mushrooms.png and b/images/terrain/mushrooms.png differ