diff --git a/cgi-bin/uebung08/hangman_lib.php b/cgi-bin/uebung08/hangman_lib.php
index 31e41fc..44ceca1 100644
--- a/cgi-bin/uebung08/hangman_lib.php
+++ b/cgi-bin/uebung08/hangman_lib.php
@@ -77,7 +77,7 @@ function guessLetter($letter) {
     
     //if the guessword doesn't contain the letter increment errorCount
     if (!$wordcontainsletter) {
-        $_SESSION['errorCount'] += 1;
+        $_SESSION['errorCount'] = $_SESSION['errorCount'] + 1;
     }
     
     //refresh the state