Teams have been told that if their 'bridge wing' is not secured to the nose then a supporting stay must now be fitted to ensure it does not flex.
Six teams are running bridge wings that span across the nose - McLaren, Toyota, Renault, Williams, Red Bull Racing and Scuderia Toro Rosso. Renault's design already featured a central stay, while the other teams will have to follow suit from Montreal.
It is understood that the move was made after the Turkish Grand Prix, where on-board video footage of some of the bridge wings over the weekend suggested that they could be flexing at high speed.
The FIA has always been keen to ensure teams do not exploit the area of moveable aerodynamic devices, and has previously moved to stamp down on the issue for Canada, where the track's characteristics mean that flexible wings can be a big advantage.
In 2006, the FIA ordered teams to introduce slot-gap separators on their rear wings for Canada in a bid to end controversy about flexible wings. This, however, did not stop Honda threatening to protest rivals BMW Sauber about their wing design at that year's race.
McLaren pioneered the bridge wing in F1 last year and, although there were suspicions from rival teams that it was a moveable aerodynamic device when it raced for the first time, the FIA technical department gave it the all-clear after a detailed inspection last May
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