Reardon (2011b) reports rapidly growing SES gaps when SES is measured by current parental income indicators. This differs dramatically from our analysis of trends in the SES-achievement gap (Hanushek et al. (2022)). We reconcile our findings with his by showing that the difference in results is due to systematic measurement errors in his analysis. When a trend line is estimated from the studies in his analysis less prone to measurement error, no upward trend in the SES-achievement gap is detected.