diff --git a/src/as/com/threerings/media/tile/TileUtil.as b/src/as/com/threerings/media/tile/TileUtil.as
index 7b3aac24..1dd2f864 100644
--- a/src/as/com/threerings/media/tile/TileUtil.as
+++ b/src/as/com/threerings/media/tile/TileUtil.as
@@ -55,7 +55,7 @@ public class TileUtil
      */
     public static function getTileHash (x :int, y :int) :int
     {
-        var seed :int = ((x ^ y) ^ MULTIPLIER) & MASK;
+        var seed :int = (((x << 2) ^ y) ^ MULTIPLIER) & MASK;
         var hash :int = (seed * MULTIPLIER + ADDEND) & MASK;
         return hash >>> 10;
     }
diff --git a/src/java/com/threerings/media/tile/TileUtil.java b/src/java/com/threerings/media/tile/TileUtil.java
index 8b423e0a..f7fa4a06 100644
--- a/src/java/com/threerings/media/tile/TileUtil.java
+++ b/src/java/com/threerings/media/tile/TileUtil.java
@@ -59,7 +59,7 @@ public class TileUtil
      */
     public static int getTileHash (int x, int y)
     {
-        long seed = ((x ^ y) ^ MULTIPLIER) & MASK;
+        long seed = (((x << 2) ^ y) ^ MULTIPLIER) & MASK;
         long hash = (seed * MULTIPLIER + ADDEND) & MASK;
         return (int) (hash >>> 30);
     }