diff --git a/includes/defaults.inc.php b/includes/defaults.inc.php
index 6b354842f..20fb803e4 100644
--- a/includes/defaults.inc.php
+++ b/includes/defaults.inc.php
@@ -785,4 +785,4 @@ $config['navbar']['manage_groups']['hide']              = 0;
 $config['summary_errors']                               = 0;
 
 // Default width of the availability map's tiles
-$config['availability-map-width']                       = 20;
+$config['availability-map-width']                       = 25;