Enrique Marquez, 24, was set to go on trial in July, but his case will now go before a jury in March, a judge in California ruled yesterday.
Both sides in the case had requested that the trial be delayed, citing the huge amount of complex documents that had to be examined.
Marquez has been charged with purchasing the rifles used by Syed Rizwan Farook and his wife Tashfeen Malik who massacred 14 people in December.
Marquez, who is being held without bail, faces up to 50 years in prison if convicted of conspiring to provide material support to terrorists, lying about about the purchase of the two weapons used in the December 2 massacre and marriage fraud.
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He allegedly entered into a sham marriage with Mariya Chernykh, a woman linked to Farook's family, in November 2014 and lied on her visa application.
Chernykh's 31-year-old sister Tatiana Farook is married to Farook's older brother Syed Raheel Farook.
The trio were indicted last month on conspiracy charges linked to the alleged sham marriage.