diff --git a/tests/javascript/unit/models/calendar.test.js b/tests/javascript/unit/models/calendar.test.js
index 98d28cd00..2121c08c7 100644
--- a/tests/javascript/unit/models/calendar.test.js
+++ b/tests/javascript/unit/models/calendar.test.js
@@ -38,7 +38,7 @@ describe('Test suite: Calendar model (models/calendar.js)', () => {
 			dav: false,
 			calendarObjects: [],
 			fetchedTimeRanges: [],
-			transparency: '',
+			transparency: 'opaque',
 		})
 	})
 
@@ -69,7 +69,7 @@ describe('Test suite: Calendar model (models/calendar.js)', () => {
 			dav: false,
 			calendarObjects: [],
 			fetchedTimeRanges: [],
-			transparency: '',
+			transparency: 'opaque',
 		})
 	})