syncdb in GeoDjango tutorial

I'm following the GeoDjango tutorial, and when I get to the "Run syncdb" section and I run "python manage.py syncdb", I get the following error:

Failed to install index for world.WorldBorder model: function addgeometrycolumn(unknown, unknown, integer, unknown, integer) is not unique
LINE 1: SELECT AddGeometryColumn('world_worldborder', 'mpoly', 4326,...
               ^
HINT:  Could not choose a best candidate function. You might need to add explicit type casts.

Sure enough there are about 5 AddGeometryColumn functions in my database created from a PostGIS database template. I understand that it's using overloads, but why isn't this working?

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