Theories on issue competition assume that there is only a limited number of issues that a person prioritises simultaneously. In this research note, we test this mechanism by using a panel study that was conducted among Belgian parents in 2019 and 2020. Between the two observations of the study, the country suffered a severe health crisis due to the COVID-19 pandemic. We investigate whether this crisis reduced the priority of environmental issues among respondents. Our results show that there was indeed a significant decline of some indicators for environmental concern, but not for others. Furthermore, we show that a higher priority for the health-related and economic consequences of the COVID-19 pandemic was associated with a steeper decline in environmental concern.