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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 4d28d3cef..a1753fcd3 100644
--- a/src/newgrf_canal.cpp
+++ b/src/newgrf_canal.cpp
@@ -58,7 +58,7 @@ static uint32 CanalGetVariable(const ResolverObject *object, byte variable, byte
case 0x81: return GetTerrainType(tile);
/* Random data for river or canal tiles, otherwise zero */
- case 0x83: return GetWaterTileRandomBits(tile);
+ case 0x83: return IsTileType(tile, MP_WATER) ? GetWaterTileRandomBits(tile) : 0;
}
DEBUG(grf, 1, "Unhandled canal variable 0x%02X", variable);