A method for synchronizing a data signal to a clock signal in a source-synchronous system, the source-synchronous system having first and second systems linked by an interface, the first system providing the clock signal to the second system, the second system providing the data signal and a return clock signal synchronous to the data signal to the first system, the method comprising: determining a first time delay between the clock signal and the return clock signal and delaying the data signal by the first time delay; after a predetermined period, determining a second time delay between the clock signal and the return clock signal; determining a difference between the first and second time delays; and, further delaying the data signal by at least a portion of the difference to thereby compensate for a temperature change of the source-synchronous system.