diff --git a/src/saveload/afterload.cpp b/src/saveload/afterload.cpp
--- a/src/saveload/afterload.cpp
+++ b/src/saveload/afterload.cpp
@@ -61,6 +61,7 @@
 #include "../timer/timer.h"
 #include "../timer/timer_game_calendar.h"
 #include "../timer/timer_game_tick.h"
+#include "../pathfinder/water_regions.h"
 
 #include "saveload_internal.h"
 
@@ -3296,6 +3297,8 @@ bool AfterLoadGame()
 		}
 	}
 
+	if (IsSavegameVersionBefore(SLV_WATER_REGIONS)) InitializeWaterRegions();
+
 	return true;
 }