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-rw-r--r--src/newgrf.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index c4e44df5a..f3a485f98 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -4052,7 +4052,7 @@ static uint32 GetPatchVariable(uint8 param)
*/
case 0x13: {
byte map_bits = 0;
- byte log_X = MapLogX() - 6;
+ byte log_X = MapLogX() - 6; // substraction is required to make the minimal size (64) zero based
byte log_Y = MapLogY() - 6;
byte max_edge = max(log_X, log_Y);