diff --git a/src/saveload/afterload.cpp b/src/saveload/afterload.cpp
--- a/src/saveload/afterload.cpp
+++ b/src/saveload/afterload.cpp
@@ -1543,6 +1543,41 @@ bool AfterLoadGame()
 		}
 	}
 
+	/* The water class was moved/unified. */
+	if (CheckSavegameVersion(146)) {
+		for (TileIndex t = 0; t < map_size; t++) {
+			switch (GetTileType(t)) {
+				case MP_STATION:
+					switch (GetStationType(t)) {
+						case STATION_OILRIG:
+						case STATION_DOCK:
+						case STATION_BUOY:
+							SetWaterClass(t, (WaterClass)GB(_m[t].m3, 0, 2));
+							SB(_m[t].m3, 0, 2, 0);
+							break;
+
+						default:
+							SetWaterClass(t, WATER_CLASS_INVALID);
+							break;
+					}
+					break;
+
+				case MP_WATER:
+					SetWaterClass(t, (WaterClass)GB(_m[t].m3, 0, 2));
+					SB(_m[t].m3, 0, 2, 0);
+					break;
+
+				case MP_OBJECT:
+					SetWaterClass(t, WATER_CLASS_INVALID);
+					break;
+
+				default:
+					/* No water class. */
+					break;
+			}
+		}
+	}
+
 	if (CheckSavegameVersion(86)) {
 		for (TileIndex t = 0; t < map_size; t++) {
 			/* Move river flag and update canals to use water class */
@@ -2153,12 +2188,6 @@ bool AfterLoadGame()
 		FOR_ALL_DEPOTS(d) d->build_date = _date;
 	}
 
-	if (CheckSavegameVersion(145)) {
-		for (TileIndex t = 0; t < map_size; t++) {
-			if (IsAirportTile(t)) SetWaterClass(t, WATER_CLASS_INVALID);
-		}
-	}
-
 	/* Road stops is 'only' updating some caches */
 	AfterLoadRoadStops();
 	AfterLoadLabelMaps();