We have measured the integrated cross-section of a transition at 5676.08 cm(-1) in the 2v(5) overtone band of formaldehyde to be (3.09 +/- 0.10) x 10(-23) cm(2) cm(-1) by cavity ringdown spectroscopy using a tunable diode laser. This measurement was used to calculate the integrated cross-section of the R-Q(1)(10) line at 5676.21 cm(-1) as (5.8 +/- 0.5) X 10(-22) cm(2) cm(-1). We compare this figure to our value of this cross-section measured using the technique of cavity enhanced absorption spectroscopy of (5.7 +/- 0.6) x 10(-22) cm(2) cm(-1) and find the results to be in good agreement. (C) 2003 Elsevier Science B.V. All rights reserved.