diff --git a/Source/render.cpp b/Source/render.cpp
index b591a5f2f..a31a0da51 100644
--- a/Source/render.cpp
+++ b/Source/render.cpp
@@ -55,21 +55,21 @@ static DWORD WallMask_FullyTrasparent[TILE_HEIGHT] = {
 };
 /** Transparent variant of RightMask. */
 static DWORD RightMask_Transparent[TILE_HEIGHT] = {
-	0xE0000000,
+	0xC0000000,
 	0xF0000000,
-	0xFE000000,
+	0xFC000000,
 	0xFF000000,
-	0xFFE00000,
+	0xFFC00000,
 	0xFFF00000,
-	0xFFFE0000,
+	0xFFFC0000,
 	0xFFFF0000,
-	0xFFFFE000,
+	0xFFFFC000,
 	0xFFFFF000,
-	0xFFFFFE00,
+	0xFFFFFC00,
 	0xFFFFFF00,
-	0xFFFFFFE0,
+	0xFFFFFFC0,
 	0xFFFFFFF0,
-	0xFFFFFFFE,
+	0xFFFFFFFC,
 	0xFFFFFFFF,
 	0xFFFFFFFF,
 	0xFFFFFFFF,