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-rw-r--r--src/newgrf_canal.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/newgrf_canal.cpp b/src/newgrf_canal.cpp
index 9bbf8fbb6..418b51755 100644
--- a/src/newgrf_canal.cpp
+++ b/src/newgrf_canal.cpp
@@ -48,7 +48,7 @@ static uint32 CanalGetVariable(const ResolverObject *object, byte variable, byte
switch (variable) {
/* Height of tile */
case 0x80: {
- uint z = GetTileZ(tile);
+ int z = GetTileZ(tile);
/* Return consistent height within locks */
if (IsTileType(tile, MP_WATER) && IsLock(tile) && GetLockPart(tile) == LOCK_PART_UPPER) z--;
return z;