diff --git a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/heatmaps/HeatmapPresenter.java b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/heatmaps/HeatmapPresenter.java
index 46825cdf7d294adadb23db7edb50009aff046191..407c2052d14a1176db10dff8c528c3649704d8a5 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/heatmaps/HeatmapPresenter.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/heatmaps/HeatmapPresenter.java
@@ -94,6 +94,7 @@ class HeatmapPresenter
         this.tooltipGenerator = new WellTooltipGenerator(model, realNumberRenderer);
         this.cachedMetadataHeatmapRenderer =
                 WellMetadataHeatmapRenderer.create(model.getWellList());
+        setWellMetadataMode();
     }
 
     /** Changes the presented heatmap to the one which shows well types. */