diff --git a/api/src/engine/models/result/heat-map-result.model.ts b/api/src/engine/models/result/heat-map-result.model.ts
index ab4d2d86ca410f8a65e61f971caff1384eb35b65..267dc3c20201236e5d11ee1cbcbb6d6d89af15a7 100644
--- a/api/src/engine/models/result/heat-map-result.model.ts
+++ b/api/src/engine/models/result/heat-map-result.model.ts
@@ -10,9 +10,9 @@ export class HeatMapResult extends Result {
   @Field(() => [[Number]])
   matrix: number[][];
 
-  @Field(() => [ChartAxis])
+  @Field(() => ChartAxis)
   xAxis: ChartAxis;
 
-  @Field(() => [ChartAxis])
+  @Field(() => ChartAxis)
   yAxis: ChartAxis;
 }