diff --git a/lib/OpenLayers/Map.js b/lib/OpenLayers/Map.js
index fecd812fc2..9ad0a38d24 100644
--- a/lib/OpenLayers/Map.js
+++ b/lib/OpenLayers/Map.js
@@ -545,10 +545,8 @@ OpenLayers.Map.prototype = {
      */
     zoomToFullExtent: function() {
         var fullExtent = this.getFullExtent();
-        this.setCenter(
-          new OpenLayers.LonLat((fullExtent.left+fullExtent.right)/2,
-                                (fullExtent.bottom+fullExtent.top)/2),
-          this.getZoomForExtent(fullExtent)
+        this.setCenter(fullExtent.getCenterLonLat(),
+                       this.getZoomForExtent(fullExtent)
         );
     },