diff --git a/cgi-bin/uebung09/questions-show.php b/cgi-bin/uebung09/questions-show.php
index 1b6c399..338c890 100644
--- a/cgi-bin/uebung09/questions-show.php
+++ b/cgi-bin/uebung09/questions-show.php
@@ -28,7 +28,7 @@ foreach($questionsobj as $question) {
         echo("<td>$question->question</td>");
 
         $color = ($question->solution == "0") ? "background-color: green" : "background-color: red";
-        echo("<td style=$color>$question->answer0</td>");
+        echo("<td style='$color'>$question->answer0</td>");
 
         $color = ($question->solution == 1) ? "background-color: green" : "background-color: red";
         echo("<td>$question->answer1</td>");