diff --git a/vendor/clouds3d.js b/vendor/clouds3d.js
index bde0245..04f15aa 100644
--- a/vendor/clouds3d.js
+++ b/vendor/clouds3d.js
@@ -283,7 +283,7 @@ var GROUND_TRAVEL_COS = 0.0;      // cos(90 deg)
 var GROUND_TRAVEL_SIN = 1.0;      // sin(90 deg)
 var GROUND_CORRIDOR_LONG = 25;    // tiles along travel direction (~3.5 min of flight at uSpeed=1)
 var GROUND_CORRIDOR_PERP = 5;     // tiles perpendicular to travel
-var GROUND_BUFFER_LONG = 1;       // refetch when this close to forward edge
+var GROUND_BUFFER_LONG = 11;       // refetch when this close to forward edge
 var GROUND_BUFFER_PERP = 1;       // refetch when this close to side edge
 // Passau tile at zoom 11
 var GROUND_BASE_X = 1099;