diff --git a/src/module/Application/config/doctrine.config.php b/src/module/Application/config/doctrine.config.php
index 8fd4602..12f96a1 100755
--- a/src/module/Application/config/doctrine.config.php
+++ b/src/module/Application/config/doctrine.config.php
@@ -3,6 +3,7 @@
 namespace Application;
 
 use Ainias\Core\Connections\MyConnection;
+use Application\DoctrineExtensions\CharLength;
 use Doctrine\ORM\Mapping\Driver\AnnotationDriver;
 
 return array(
@@ -10,7 +11,7 @@ return array(
         'driver' => array(
             'orm_default' => array(
                 'drivers' => array(
-                    __NAMESPACE__.'\Model' => 'entities_default',
+                    __NAMESPACE__ . '\Model' => 'entities_default',
                 ),
             ),
             'entities_default' => array(
@@ -19,5 +20,12 @@ return array(
                 )
             )
         ),
+        'configuration' => [
+            'orm_default' => [
+                'numeric_functions' => [
+                    'CHAR_LENGTH' => CharLength::class,
+                ],
+            ],
+        ],
     ),
 );
diff --git a/src/module/Application/src/DoctrineExtensions/CharLength.php b/src/module/Application/src/DoctrineExtensions/CharLength.php
new file mode 100644
index 0000000..ad1ec0a
--- /dev/null
+++ b/src/module/Application/src/DoctrineExtensions/CharLength.php
@@ -0,0 +1,30 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: silas
+ * Date: 22.10.18
+ * Time: 15:24
+ */
+
+namespace Application\DoctrineExtensions;
+
+
+use Doctrine\ORM\Query\AST\Functions\FunctionNode;
+use Doctrine\ORM\Query\Lexer;
+
+class CharLength extends FunctionNode
+{
+    private $expr;
+
+    public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)
+    {
+        return 'CHAR_LENGTH('.$sqlWalker->walkArithmeticPrimary($this->expr1).')';
+    }
+    public function parse(\Doctrine\ORM\Query\Parser $parser)
+    {
+        $parser->match(Lexer::T_IDENTIFIER);
+        $parser->match(Lexer::T_OPEN_PARENTHESIS);
+        $this->expr1 = $parser->ArithmeticExpression();
+        $parser->match(Lexer::T_CLOSE_PARENTHESIS);
+    }
+}
\ No newline at end of file
diff --git a/src/module/Application/src/Model/Repository/WordRepository.php b/src/module/Application/src/Model/Repository/WordRepository.php
index 693cc66..95e36e9 100755
--- a/src/module/Application/src/Model/Repository/WordRepository.php
+++ b/src/module/Application/src/Model/Repository/WordRepository.php
@@ -56,8 +56,8 @@ class WordRepository extends StandardRepository
         $offset = rand(0,$numberWords-1);
 
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.checked", "0"));
-        $queryBuilder->andWhere($queryBuilder->expr()->gte($queryBuilder->expr()->length("w.word"), ":minLength"));
-        $queryBuilder->andWhere($queryBuilder->expr()->lte($queryBuilder->expr()->length("w.word"), ":maxLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->gte("CHAR_LENGTH(w.word)", ":minLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->lte("CHAR_LENGTH(w.word)", ":maxLength"));
         $queryBuilder->setParameter("minLength", $minLength);
         $queryBuilder->setParameter("maxLength", $maxLength);
         $queryBuilder->setMaxResults(1);
@@ -76,9 +76,11 @@ class WordRepository extends StandardRepository
         $queryBuilder = $this->_em->createQueryBuilder();
         $queryBuilder->select("COUNT(w.id)")->from(Word::class, "w");
 
+//        $queryBuilder->andWhere($queryBuilder->expr()->eq("w.word", "Sechsfüßer"));
+
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.checked", "0"));
-        $queryBuilder->andWhere($queryBuilder->expr()->gte($queryBuilder->expr()->length("w.word"), ":minLength"));
-        $queryBuilder->andWhere($queryBuilder->expr()->lte($queryBuilder->expr()->length("w.word"), ":maxLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->gte("CHAR_LENGTH(w.word)", ":minLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->lte("CHAR_LENGTH(w.word)", ":maxLength"));
         $queryBuilder->setParameter("minLength", $minLength);
         $queryBuilder->setParameter("maxLength", $maxLength);
         $queryBuilder->setMaxResults(1);
@@ -92,8 +94,8 @@ class WordRepository extends StandardRepository
 
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.checked", "1"));
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.deleted", "1"));
-        $queryBuilder->andWhere($queryBuilder->expr()->gte($queryBuilder->expr()->length("w.word"), ":minLength"));
-        $queryBuilder->andWhere($queryBuilder->expr()->lte($queryBuilder->expr()->length("w.word"), ":maxLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->gte("CHAR_LENGTH(w.word)", ":minLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->lte("CHAR_LENGTH(w.word)", ":maxLength"));
         $queryBuilder->setParameter("minLength", $minLength);
         $queryBuilder->setParameter("maxLength", $maxLength);
         $queryBuilder->setMaxResults(1);
@@ -107,8 +109,8 @@ class WordRepository extends StandardRepository
 
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.checked", "1"));
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.deleted", "0"));
-        $queryBuilder->andWhere($queryBuilder->expr()->gte($queryBuilder->expr()->length("w.word"), ":minLength"));
-        $queryBuilder->andWhere($queryBuilder->expr()->lte($queryBuilder->expr()->length("w.word"), ":maxLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->gte("CHAR_LENGTH(w.word)", ":minLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->lte("CHAR_LENGTH(w.word)", ":maxLength"));
         $queryBuilder->setParameter("minLength", $minLength);
         $queryBuilder->setParameter("maxLength", $maxLength);
         $queryBuilder->setMaxResults(1);
@@ -121,8 +123,8 @@ class WordRepository extends StandardRepository
         $queryBuilder->select("COUNT(w.id)")->from(Word::class, "w");
 
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.checked", "-1"));
-        $queryBuilder->andWhere($queryBuilder->expr()->gte($queryBuilder->expr()->length("w.word"), ":minLength"));
-        $queryBuilder->andWhere($queryBuilder->expr()->lte($queryBuilder->expr()->length("w.word"), ":maxLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->gte("CHAR_LENGTH(w.word)", ":minLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->lte("CHAR_LENGTH(w.word)", ":maxLength"));
         $queryBuilder->setParameter("minLength", $minLength);
         $queryBuilder->setParameter("maxLength", $maxLength);
         $queryBuilder->setMaxResults(1);
@@ -137,7 +139,7 @@ class WordRepository extends StandardRepository
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.checked", "1"));
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.deleted", "0"));
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.used", "0"));
-        $queryBuilder->andWhere($queryBuilder->expr()->eq($queryBuilder->expr()->length("w.word"), ":length"));
+        $queryBuilder->andWhere($queryBuilder->expr()->eq("CHAR_LENGTH(w.word)", ":length"));
         $queryBuilder->setParameter("length", $length);
         return $queryBuilder->getQuery()->getResult();
     }
@@ -150,8 +152,8 @@ class WordRepository extends StandardRepository
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.checked", "1"));
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.deleted", "0"));
         $queryBuilder->andWhere($queryBuilder->expr()->eq("w.used", "0"));
-        $queryBuilder->andWhere($queryBuilder->expr()->gte($queryBuilder->expr()->length("w.word"), ":minLength"));
-        $queryBuilder->andWhere($queryBuilder->expr()->lte($queryBuilder->expr()->length("w.word"), ":maxLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->gte("CHAR_LENGTH(w.word)", ":minLength"));
+        $queryBuilder->andWhere($queryBuilder->expr()->lte("CHAR_LENGTH(w.word)", ":maxLength"));
         $queryBuilder->setParameter("minLength", $minLength);
         $queryBuilder->setParameter("maxLength", $maxLength);
         $queryBuilder->setMaxResults(1);