Andrew Barrowman's early goal gave Dunfermline victory at Dumbarton and sent the Pars top of Division One.
The breakthrough came within the first minute as Barrowman tucked away Alex Whittle's cross.
Jordan McMillan cleared off the line as Steven McDougall threatened an equaliser for the hosts.
Dumbarton's Jamie Ewings made saves to deny Shaun Byrne and Ryan Wallace in the second half with opposing keeper Paul Gallacher tested by James Lister.
And, with Morton and Partick Thistle dropping points, Jim Jefferies' side lead the division on goal difference.
Dumbarton: Ewings, Devlin, Graham, Lithgow, Forsyth, Gilhaney,Turner, Agnew, McDougall (Prunty 73), Fleming (McCusker 61), Lister. Subs Not Used: Grindlay, Nicoll, Smith.
Dunfermline: Gallacher, McMillan (Thomson 46), Dowie, Morris, Jordan, Falkingham, Geggan, Byrne, Whittle (Dargo 84), Barrowman, Wallace. Subs Not Used: Hrivnak, Kirk, Potter.
Goals: Barrowman 1.
Ref: Iain Brines