An adjustable roller blind mounting bracket comprising a bracket member adapted for mounting to a surface, an adjustment plate slidably received upon the interior face of the bracket member, an adjuster to alter the position of the adjustment plate relative to the bracket member; and a shield secured to the adjustment plate and moveable therewith. The adjustment plate releasably receives and supports a roller tube shaft of a roller tube of the roller blind. The shield has an interior side surface offset from the adjustment plate that prevents contact between the adjuster and blind fabric received about the roller tube.