diff --git a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
index 3149129..435847d 100644
--- a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
+++ b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
@@ -187,11 +187,11 @@ public class Spreadsheet {
 
 
 		else if (formula.startsWith("MITTELWERT("))  // e.g. MITTELWERT(A3:A5)
-			if (formula.length() < 17)
+			if (formula.length() < 18)
 				result = "" + average(substringStartCell1, substringEndCell1);
-			else if (formula.length() < 18)
-				result = "" + average(substringStartCell2, substringEndCell2);
 			else if (formula.length() < 19)
+				result = "" + average(substringStartCell2, substringEndCell2);
+			else if (formula.length() < 20)
 				result = "" + average(substringStartCell3, substringEndCell2);
 			else
 				result = "0";