diff --git a/cis/private/lehre/benotungstool/functions.inc.php b/cis/private/lehre/benotungstool/functions.inc.php
index 7c99b9cb5..a658a1610 100755
--- a/cis/private/lehre/benotungstool/functions.inc.php
+++ b/cis/private/lehre/benotungstool/functions.inc.php
@@ -25,7 +25,7 @@ function makeUploadName($conn, $which, $lehreinheit_id=null, $uebung_id=null, $s
 		
 		$name .= "_".$uebung_id."_".$date;	
 	}
-
+	$name = str_replace(":","-",$name);
 	return $name;
 }
 ?>
\ No newline at end of file