Jeffrey Labelle's lawyer said Friday the psychiatrist conducting the assessment to determine his level of criminal responsibility needs more time.
Labelle, 21, faces one charge under the terrorism hoax section of the Criminal Code, having allegedly given police reason to believe a terrorist activity could occur.
A Quebec Court judge earlier declared Labelle a "lone wolf" and a "danger to society" in denying him bail last December and ordered the assessment.
"The psychiatrist in the file is asking for an extension, a delay to complete the report," defence lawyer Julie Bernier told reporters Friday.
Labelle's arrest followed a joint investigation between Montreal police and the RCMP that started when authorities were tipped off by social workers who had spoken to the suspect's mother.
Labelle's mom allegedly told social workers and, later police, that her son threatened to carry out a terrorist attack.
Montreal police said that after searching the home Labelle shared with his mother and grandmother, they found a city map that showed the co-ordinates of four different police stations.
During the bail hearing, the court heard testimony that hinted at a deeply troubled, paranoid young man who had recently tried to kill himself and allegedly converted to a violent form of Islam.
Labelle appeared alert while in court Friday.
He was smiling and waved to friends in the back of the courtroom during his brief court appearance.
The case returns to court on Mar. 11.