A sprinkler assembly for use in an attic or under a sloped roof or ceiling and includes a body having an inlet opening and a discharge opening. A support extends from the body and a closure device is releasably positioned at the discharge opening to close the passageway. A heat responsive trigger releasably retains the closure device at the discharge opening of the body. A flow shaper is supported by the support and includes a transverse wall portion intersecting a central axis of the discharge opening. A pair of laterally spaced side walls each extend from the transverse wall portion toward the body and a pair of mounting base portions extend from the pair of side walls and connect the flow shaper to the support. The flow shaper provides a simple and inexpensive design for providing adequate distribution of fire suppressant both laterally and directly beneath the sprinkler.