Verb + de + infinitive
risquer
de
The constructions
derisquer de + infinitif
Tu risques de rater ton train.
Do not writeTu risques à rater ton train.
Why
Risquer de before an infinitive says that an unwelcome event is possible. Before a noun, risquer is direct: risquer sa vie. The pronominal se risquer à takes à, but it is rare.