diff --git a/overviewer_core/settingsDefinition.py b/overviewer_core/settingsDefinition.py
index d2e357c..91c2e9b 100644
--- a/overviewer_core/settingsDefinition.py
+++ b/overviewer_core/settingsDefinition.py
@@ -80,6 +80,7 @@ renders = Setting(required=True, default=util.OrderedDict(),
             "changelist": Setting(required=False, validator=validateStr, default=None),
             "markers": Setting(required=False, validator=validateMarkers, default=[]),
             "showspawn": Setting(required=False, validator=validateBool, default=True),
+            "base": Setting(required=False, validator=validateStr, default=None),
 
             # Remove this eventually (once people update their configs)
             "worldname": Setting(required=False, default=None,
diff --git a/overviewer_core/tileset.py b/overviewer_core/tileset.py
index ab25a2a..4fa769f 100644
--- a/overviewer_core/tileset.py
+++ b/overviewer_core/tileset.py
@@ -513,7 +513,7 @@ class TileSet(object):
                 defaultZoom = 1,
                 maxZoom = self.treedepth,
                 path = self.options.get('name'),
-                base = '',
+                base = self.options.get('base'),
                 bgcolor = bgcolorformat(self.options.get('bgcolor')),
                 world = self.options.get('worldname_orig') +
                     (" - " + self.options.get('dimension') if self.options.get('dimension') != 'default' else ''),