diff --git a/OpenRa.Game/Ore.cs b/OpenRa.Game/Ore.cs
index 90005f01e9..69e58b5feb 100644
--- a/OpenRa.Game/Ore.cs
+++ b/OpenRa.Game/Ore.cs
@@ -137,6 +137,12 @@ namespace OpenRa.Game
 			return ore;
 		}
 
+		public static bool IsOverlaySolid(this Map map, int2 p)
+		{
+			var o = map.MapTiles[p.X, p.Y].overlay;
+			return o < overlayIsFence.Length && overlayIsFence[o];
+		}
+
 		public static bool[] overlayIsFence =
 			{
 				true, true, true, true, true,
diff --git a/OpenRa.Game/PathSearch.cs b/OpenRa.Game/PathSearch.cs
index 9967d2b77c..dcfee5c826 100755
--- a/OpenRa.Game/PathSearch.cs
+++ b/OpenRa.Game/PathSearch.cs
@@ -47,6 +47,8 @@ namespace OpenRa.Game
 					continue;
 				if (customBlock != null && customBlock(newHere))
 					continue;
+				if (Game.map.IsOverlaySolid(newHere))
+					continue;
 
 				var est = heuristic( newHere );
 				if( est == float.PositiveInfinity )