Property Interpolation error

[DrDeath72]

http://lesscss.org/features/#variables-feature-properties

.vendor(@property, @value) {
    -webkit-@{property}:@value;
     -khtml-@{property}:@value;
       -moz-@{property}:@value;
        -ms-@{property}:@value;
         -o-@{property}:@value;
            @{property}:@value;
}

.bla { .vendor(border-radius, 5px); }