Nav Link Search quesiton

[XFFA.IR Bot]

I am working on creating a link to pull out posts with set prefix ID

{{ link('search/search', null, { 't': 'post', 'c[prefixes][0]': 2, 'c[users]': $xf.visitor.username, 'o': 'relevance' }) }}
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The output:

?c[prefixes][0]=2&c[users]=USER&o=relevance
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instead of:

t=post&c[prefixes][0]=2&c[users]=USER&o=relevance
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The "t=post" part is not coming up. Any tips as to what it is going wrong?