Tommy Lonergan's second-half goal earned Waterford a vital three points, lifting the Blues clear of the Premier Division's bottom spot.
Tommy Lonergan scored the only goal as Waterford boosted their SSE Airtricity Premier Division survival hopes with a 1-0 win over Shelbourne at the RSC.
The striker headed home early in the second half from a Pádraig Amond cross to secure all three points for Graham Coughlan's side.
Lonergan had the chance to add a second from the penalty spot later in the game, but his effort struck the crossbar.
Shelbourne pushed for an equaliser in the closing stages, but Waterford held firm to record a victory that moves them three points clear of bottom-placed Sligo Rovers.

Wales Stun All Blacks To End 73-Year Wait For Victory
Ireland Face Must-Win Kosovo Clash After Narrow Defeat To Austria
Kildare Trio Feature As Ireland Overcome Fiji In Nations Championship
Kildare's Sean O'Haire Kicks Dramatic Last-Minute Winner In American College Football
Sunday Morning Sports Update
Milltown Through To Leinster Intermediate Semi-Finals After Victory Over Meath Champions
Sarsfields Leinster Championship Campaign Ends After Heavy Defeat To Cuala
More Than 20 Horses Withdrawn At Cheltenham Over Ground Conditions