diff --git a/uni/lib/model/entities/exam.dart b/uni/lib/model/entities/exam.dart
index 1bfe20d0f..36c56fd58 100644
--- a/uni/lib/model/entities/exam.dart
+++ b/uni/lib/model/entities/exam.dart
@@ -66,7 +66,7 @@ class Exam {
   String weekDay(AppLocale locale) {
     return DateFormat.EEEE(locale.localeCode.languageCode)
         .dateSymbols
-        .WEEKDAYS[begin.weekday - 1];
+        .WEEKDAYS[begin.weekday % 7];
   }
 
   String month(AppLocale locale) {