diff --git a/packages/sections/src/variant/GWASCredibleSets/PheWasPlot.tsx b/packages/sections/src/variant/GWASCredibleSets/PheWasPlot.tsx
index f75760c4c..573f2a85c 100644
--- a/packages/sections/src/variant/GWASCredibleSets/PheWasPlot.tsx
+++ b/packages/sections/src/variant/GWASCredibleSets/PheWasPlot.tsx
@@ -354,7 +354,7 @@ function tooltipContent(data) {
         </Box>
       </HTMLTooltipRow>
       <HTMLTooltipRow label="Credible set size" data={data} labelWidth={labelWidth}>
-        {data.locus?.count ?? naLabel}
+        {data.locusSize?.count ?? naLabel}
       </HTMLTooltipRow>
     </HTMLTooltipTable>
   );