Despite extensive analyses, we failed to reproduce Job et al.’s (2010) key findings: (a) a significant main effect of ego depletion (i.e., worse Stroop performance in the depletion condition than in the control condition) and (b) a significant moderation of this ego-depletion effect by individual differences in willpower mindset (i.e., primarily individuals holding the belief that willpower is limited demonstrate the ego-depletion effect). Willpower depletion and “grit” both did not reproduce.