diff --git a/app/src/main/java/uk/ac/ebi/atlas/experimentpage/tooltip/ContrastSummaryController.java b/app/src/main/java/uk/ac/ebi/atlas/experimentpage/tooltip/ContrastSummaryController.java
index 6ded26ad..b4a23e08 100644
--- a/app/src/main/java/uk/ac/ebi/atlas/experimentpage/tooltip/ContrastSummaryController.java
+++ b/app/src/main/java/uk/ac/ebi/atlas/experimentpage/tooltip/ContrastSummaryController.java
@@ -22,7 +22,7 @@
 @Scope("request")
 public class ContrastSummaryController {
 
-    private ExperimentTrader experimentTrader;
+    private final ExperimentTrader experimentTrader;
 
     @Inject
     public ContrastSummaryController(ExperimentTrader experimentTrader) {
@@ -44,7 +44,7 @@ public String getTooltipContrastContent(@RequestParam(value = "experimentAccessi
             throw new IllegalArgumentException("No contrast with ID " + contrastId + " found.");
         }
 
-        ExperimentDesign experimentDesign = differentialExperiment.getExperimentDesign();
+        ExperimentDesign experimentDesign = experimentTrader.getExperimentDesign(experimentAccession);
 
         ContrastSummary contrastSummary = new ContrastSummaryBuilder()
                 .withExperimentDesign(experimentDesign)