diff --git a/library/Director/IcingaConfig/AssignRenderer.php b/library/Director/IcingaConfig/AssignRenderer.php
index e0c58495..454e1f34 100644
--- a/library/Director/IcingaConfig/AssignRenderer.php
+++ b/library/Director/IcingaConfig/AssignRenderer.php
@@ -85,7 +85,8 @@ class AssignRenderer
     protected function renderFilterExpression(FilterExpression $filter)
     {
         $column = $filter->getColumn();
-        $expression = $filter->getExpression();
+        $expression = $this->renderExpressionValue(json_decode($filter->getExpression()));
+
         if ($filter instanceof FilterEqual) {
             return sprintf(
                 '%s == %s',
@@ -154,6 +155,11 @@ class AssignRenderer
         }
     }
 
+    protected function renderExpressionValue($value)
+    {
+        return IcingaConfigHelper::renderPhpValue($value);
+    }
+
     protected function renderFilterChain(FilterChain $filter)
     {
         // TODO: brackets if deeper level?
diff --git a/library/Director/IcingaConfig/IcingaConfigHelper.php b/library/Director/IcingaConfig/IcingaConfigHelper.php
index 807b6776..4ae287be 100644
--- a/library/Director/IcingaConfig/IcingaConfigHelper.php
+++ b/library/Director/IcingaConfig/IcingaConfigHelper.php
@@ -2,6 +2,7 @@
 
 namespace Icinga\Module\Director\IcingaConfig;
 
+use Icinga\Exception\IcingaException;
 use Icinga\Exception\ProgrammingError;
 
 class IcingaConfigHelper
@@ -63,15 +64,36 @@ class IcingaConfigHelper
 
     public static function renderBoolean($value)
     {
-        if ($value === 'y') {
+        if ($value === 'y' || $value === true) {
             return 'true';
-        } elseif ($value === 'n') {
+        } elseif ($value === 'n' || $value === false) {
             return 'false';
         } else {
             throw new ProgrammingError('%s is not a valid boolean', $value);
         }
     }
 
+    protected static function renderInteger($value)
+    {
+        return (string) $value;
+    }
+
+    protected static function renderFloat($value)
+    {
+        // Render .0000 floats as integers, mainly because of some JSON
+        // implementations:
+        if ((string) (int) $value === (string) $value) {
+            return static::renderInteger((int) $value);
+        } else {
+            return sprintf('%F', $value);
+        }
+    }
+
+    protected static function renderNull()
+    {
+        return 'null';
+    }
+
     // TODO: Find out how to allow multiline {{{...}}} strings.
     //       Parameter? Dedicated method? Always if \n is found?
     public static function renderString($string)
@@ -103,6 +125,28 @@ class IcingaConfigHelper
         return '"' . $string . '"';
     }
 
+    public static function renderPhpValue($value)
+    {
+        if (is_null($value)) {
+            return static::renderNull();
+        } elseif (is_bool($value)) {
+            return static::renderBoolean($value);
+        } elseif (is_integer($value)) {
+            return static::renderInteger($value);
+        } elseif (is_float($value)) {
+            return static::renderFloat($value);
+        // TODO:
+        // } elseif (is_object($value) || static::isAssocArray($value)) {
+        //     return static::renderHash($value, $prefix);
+        // } elseif (is_array($value)) {
+        //     return static::renderArray($value, $prefix);
+        } elseif (is_string($value)) {
+            return static::renderString($value);
+        } else {
+            throw new IcingaException('Unexpected type %s', var_export($value, 1));
+        }
+    }
+
     public static function renderDictionaryKey($key)
     {
         if (preg_match('/^[a-z_]+[a-z0-9_]*$/i', $key)) {
diff --git a/test/php/library/Director/IcingaConfig/AssignRendererTest.php b/test/php/library/Director/IcingaConfig/AssignRendererTest.php
index 70aa45c1..a15b8e42 100644
--- a/test/php/library/Director/IcingaConfig/AssignRendererTest.php
+++ b/test/php/library/Director/IcingaConfig/AssignRendererTest.php
@@ -42,6 +42,18 @@ class AssignRendererTest extends BaseTestCase
         );
     }
 
+    public function testWhetherSlashesAreNotEscaped()
+    {
+        $string = 'host.name=' . json_encode('a/b');
+
+        $expected = 'assign where host.name == "a/b"';
+
+        $this->assertEquals(
+            $expected,
+            $this->renderer($string)->renderAssign()
+        );
+    }
+
     protected function renderer($string)
     {
         return AssignRenderer::forFilter(Filter::fromQueryString($string));