diff --git a/geoposition/static/geoposition/geoposition.js b/geoposition/static/geoposition/geoposition.js
index eab8895..ee8b596 100644
--- a/geoposition/static/geoposition/geoposition.js
+++ b/geoposition/static/geoposition/geoposition.js
@@ -36,8 +36,8 @@ if (jQuery != undefined) {
                 $searchInput = $('<input>', {'type': 'search', 'placeholder': 'Start typing an address …'}),
                 $latitudeField = $container.find('input.geoposition:eq(0)'),
                 $longitudeField = $container.find('input.geoposition:eq(1)'),
-                latitude = parseFloat($latitudeField.val()) || null,
-                longitude = parseFloat($longitudeField.val()) || null,
+                latitude = parseFloat($latitudeField.val()) || 0,
+                longitude = parseFloat($longitudeField.val()) || 0,
                 map,
                 mapLatLng,
                 mapOptions,