Using the Parikh-Wilczek, Hamilton-Jacobi, and Damour-Ruffini methods, we investigate the Hawking radiation from a Garfinkle-Horowitz-Strominger dilatonic black hole. When energy conservation is considered, the same result can be obtained: the radiation spectrum is not precisely thermal. The corrected spectrum is consistent with the underlying unitary quantum theory, which can be used to explain the information loss paradox.