This paper presents the results of a study aiming at evaluating the effect of austenite spacing on the sour cracking resistance of a duplex stainless steel. The stress corrosion cracking resistance was assessed using slow strain rate (SSRT) and constant load tests. Under SSRT, a clear effect of the austenite spacing is observed. Above a threshold spacing, the pH-pH2S acceptability domains are smaller as the austenite spacing increases. This effect is however not seen under constant load at 90% of the actual yield strength, suggesting that a dynamic straining or a large plastic strain is needed to highlight the effect of this parameter.