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-rw-r--r--water_cmd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/water_cmd.c b/water_cmd.c
index dee9b2fe8..7c95061cd 100644
--- a/water_cmd.c
+++ b/water_cmd.c
@@ -215,7 +215,7 @@ int32 CmdBuildCanal(int x, int y, uint32 flags, uint32 p1, uint32 p2)
int size_x, size_y;
int sx, sy;
- if (p1 > MapSize()) return CMD_ERROR;
+ if (p1 >= MapSize()) return CMD_ERROR;
sx = TileX(p1);
sy = TileY(p1);