diff --git a/assets/src/scripts/components/hydrograph/drawing-data.spec.js b/assets/src/scripts/components/hydrograph/drawing-data.spec.js
index 0eb009ef1c907176319e324c141d15b5664ea2f9..f523aee7e88e245096125f19386c25ca531fea8d 100644
--- a/assets/src/scripts/components/hydrograph/drawing-data.spec.js
+++ b/assets/src/scripts/components/hydrograph/drawing-data.spec.js
@@ -192,6 +192,7 @@ const TEST_DATA = {
             }
         }
     },
+    ianaTimeZone: 'America/Chicago',
     ivTimeSeriesState: {
         currentIVVariableID: '45807197',
         currentIVDateRangeKind: 'P7D',