diff --git a/app/Exports/AttendanceGroupedExportSingleView.php b/app/Exports/AttendanceGroupedExportSingleView.php
index b9932a4..71141e8 100644
--- a/app/Exports/AttendanceGroupedExportSingleView.php
+++ b/app/Exports/AttendanceGroupedExportSingleView.php
@@ -40,6 +40,6 @@ class AttendanceGroupedExportSingleView implements FromView, WithTitle
             $this->groupedValue = "{$subject} {$date}";
         }
 
-        return str_replace(":", "-", "{$this->groupedValue}");
+        return substr(str_replace(":", "-", "{$this->groupedValue}"), 0, 30);
     }
 }