A school in Britain has banned a 13-year-old boy from taking part in Movember because it's not an "inclusive" activity.

Gus Hooker has been shaving since he was nine and wanted to raise some money for Prostate Cancer UK by joining men (and boys) around the world growing facial hair for Movember, the BBC reports.

But a moustache would stand out among the boys and girls at the Priory Academy. It wouldn't be something all students, regardless of age or gender, would be able to participate in, the school said in a statement to the news organization.

"In a coeducational school with young children, growing facial hair would not be an activity that many children would be able to join in with," the statement said.

"Whilst the school dress code does not explicitly mention facial hair, it does mention unusual hair styles and colouring that are contrary to a smart uniform appearance."

According to the report, Hooker wanted to take part in Movember because his grandfather recently beat cancer.