Stop jQuery .load response from being cached

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I have the following code making a GET request on a URL:

$('#searchButton').click(function() {
    $('#inquiry').load('/portal/?f=searchBilling&pid=' + $('#query').val());            
});

But the returned result is not always reflected. For example, I made a change in the response that spit out a stack trace but the stack trace did not appear when I clicked on the search button. I looked at the underlying PHP code that controls the ajax response and it had the correct code and visiting the page directly showed the correct result but the output returned by .load was old.

If I close the browser and reopen it it works once and then starts to return the stale information. Can I control this by jQuery or do I need to have my PHP script output headers to control caching?

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