diff --git a/lib/Doctrine/ORM/Query/Parser.php b/lib/Doctrine/ORM/Query/Parser.php
index 798afa0ce..791f765e9 100644
--- a/lib/Doctrine/ORM/Query/Parser.php
+++ b/lib/Doctrine/ORM/Query/Parser.php
@@ -2308,7 +2308,8 @@ class Parser
             if ($peek['value'] == '.') {
                 return $this->StateFieldPathExpression();
             } else if ($peek['value'] == '(') {
-                return $this->FunctionsReturningStrings();
+                // do NOT directly go to FunctionsReturningString() because it doesnt check for custom functions.
+                return $this->FunctionDeclaration();
             } else {
                 $this->syntaxError("'.' or '('");
             }
diff --git a/tests/Doctrine/Tests/ORM/Query/LanguageRecognitionTest.php b/tests/Doctrine/Tests/ORM/Query/LanguageRecognitionTest.php
index 8dccd2cba..2733d80f7 100644
--- a/tests/Doctrine/Tests/ORM/Query/LanguageRecognitionTest.php
+++ b/tests/Doctrine/Tests/ORM/Query/LanguageRecognitionTest.php
@@ -482,6 +482,16 @@ class LanguageRecognitionTest extends \Doctrine\Tests\OrmTestCase
         $this->assertValidDQL('SELECT u, u.id + ?1 AS someNumber FROM Doctrine\Tests\Models\CMS\CmsUser u');
     }
 
+    /**
+     * @group DDC-1091
+     */
+    public function testCustomFunctionsReturningStringInStringPrimary()
+    {
+        $this->_em->getConfiguration()->addCustomStringFunction('CC', 'Doctrine\ORM\Query\AST\Functions\ConcatFunction');
+
+        $this->assertValidDQL("SELECT u FROM Doctrine\Tests\Models\CMS\CmsUser u WHERE CC('%', u.name) LIKE '%foo%'", true);
+    }
+
     /**
      * @group DDC-505
      */