diff --git a/src/Airports/GenAirports/build.cxx b/src/Airports/GenAirports/build.cxx
index d334ca62..be989ddb 100644
--- a/src/Airports/GenAirports/build.cxx
+++ b/src/Airports/GenAirports/build.cxx
@@ -311,7 +311,7 @@ static void build_runway( const TGRunway& rwy_info,
     } else {
 	base = gen_runway_area_w_extend( rwy_info, 0.0, 20.0, 20.0 );
         // also clear a safe area around the runway
-        safe_base = gen_runway_area_w_extend( rwy_info, 0.0, 150.0, 60.0 );
+        safe_base = gen_runway_area_w_extend( rwy_info, 0.0, 180.0, 50.0 );
     }
     *apt_clearing = polygon_union(safe_base, *apt_clearing);